This is almost interchangeable with "top 10 characters based on fighting style" since almost every fighter character basically has a unique fighting style of their own. This just goes to show how much thought Oda puts into characterisation through fighting styles (not so much the fights themselves).
My own criteria are:
a. Visual appeal of the fighting style on panel. Basically just how interesting attacks look on panel
b. Execution of the fighting style in combat. This includes things like interactivity with environment and such.
c. The conceptualisation of the fighting style. This covers how the fighting style fits the character uniquely and the amount of creativity put into the fighting style.
Here's my top 10
1. Zoro (of course)
Three sword style from conceptualisation to visual Appeal is A++. The use of animal auras and actual stances and the number of techniques on hand and how Zoro developed the style are all wonderfully done. It gets a point lower for the Execution on panel where The anime does better with showing this fighting style in actual combat than the manga.
2. Luffy
The gum gum style is easily the best fighting in execution on panel. Oda even says he picked this power for Luffy specifically for how fun it is to draw. Its a bit lower on visual appeal mostly being made up of the same motion of stretching arm then punch but the weight of the punches are executed masterfully with great perpective shots.
3. KatakurI
This is one of the best fighting styles when it comes to the actual conceptualisation considering how Oda made it match Katakuri's character. Also peerless donuts is a way more visually appealing use of Awakening than God threads. Speaking of which.
4. Doflamingo
This thread style doesn't have high visual appeal but it's up there when it comes to execution. I mean this style is made for comic books with things like invisible thread that just cut things so fast it's like no motion is noticed. The very nature of this is written for comics panels with how still images imitate motion and speed. Similar to Law's fighting style.
5. Law
I mean of course this is a masterpiece conceptually to have these vague medical procedure abilities as a fighting style but what's truly amazing is the Execution of these abilities on panel. There's no much visual appeal or variance in techniques but even the few abilities just carry so much weight when done well on panel such as of course the Punk hazard cut.
6. Kuzan
The Execution of thus fighting style is what puts it so high up for me. Since all the attacks technically look the same, the impact of the attacks is what really brings elevates this ice style With massive environmental effects and utility.
7. Kizaru
This light based fighting style from the little we've seen of it is some of the best executed combat styles in the series. With so much utility and impact on page, it's one of those abilities that seems like Oda can do hundreds of things with it.
8. Franky
Franky's mix of close combat brawling and weaponry has always been one of my favourites in execution. It lacks in concept what it makes up in utility in combat situations.
9. Robin (yup)
Despite the very few times we see this fighting style, it still remains the best fighting style conceptually to me in the story. The very nature of this ability has so much potential that it's infrequent use hurts to see.
10. CP-9
The entire martial art of Rokushiki is an amazing example of how execution of even few abilities in combat work when used in specific environments and against specific opponents. For example Fukuro vs Franky is an awesome showcase of execution of a fighting style where the specific environment created a whole other set of opportunities for the same abilities essentially.
My own criteria are:
a. Visual appeal of the fighting style on panel. Basically just how interesting attacks look on panel
b. Execution of the fighting style in combat. This includes things like interactivity with environment and such.
c. The conceptualisation of the fighting style. This covers how the fighting style fits the character uniquely and the amount of creativity put into the fighting style.
Here's my top 10
1. Zoro (of course)
Three sword style from conceptualisation to visual Appeal is A++. The use of animal auras and actual stances and the number of techniques on hand and how Zoro developed the style are all wonderfully done. It gets a point lower for the Execution on panel where The anime does better with showing this fighting style in actual combat than the manga.
2. Luffy
The gum gum style is easily the best fighting in execution on panel. Oda even says he picked this power for Luffy specifically for how fun it is to draw. Its a bit lower on visual appeal mostly being made up of the same motion of stretching arm then punch but the weight of the punches are executed masterfully with great perpective shots.
3. KatakurI
This is one of the best fighting styles when it comes to the actual conceptualisation considering how Oda made it match Katakuri's character. Also peerless donuts is a way more visually appealing use of Awakening than God threads. Speaking of which.
4. Doflamingo
This thread style doesn't have high visual appeal but it's up there when it comes to execution. I mean this style is made for comic books with things like invisible thread that just cut things so fast it's like no motion is noticed. The very nature of this is written for comics panels with how still images imitate motion and speed. Similar to Law's fighting style.
5. Law
I mean of course this is a masterpiece conceptually to have these vague medical procedure abilities as a fighting style but what's truly amazing is the Execution of these abilities on panel. There's no much visual appeal or variance in techniques but even the few abilities just carry so much weight when done well on panel such as of course the Punk hazard cut.
6. Kuzan
The Execution of thus fighting style is what puts it so high up for me. Since all the attacks technically look the same, the impact of the attacks is what really brings elevates this ice style With massive environmental effects and utility.
7. Kizaru
This light based fighting style from the little we've seen of it is some of the best executed combat styles in the series. With so much utility and impact on page, it's one of those abilities that seems like Oda can do hundreds of things with it.
8. Franky
Franky's mix of close combat brawling and weaponry has always been one of my favourites in execution. It lacks in concept what it makes up in utility in combat situations.
9. Robin (yup)
Despite the very few times we see this fighting style, it still remains the best fighting style conceptually to me in the story. The very nature of this ability has so much potential that it's infrequent use hurts to see.
10. CP-9
The entire martial art of Rokushiki is an amazing example of how execution of even few abilities in combat work when used in specific environments and against specific opponents. For example Fukuro vs Franky is an awesome showcase of execution of a fighting style where the specific environment created a whole other set of opportunities for the same abilities essentially.