There's a difference between facts and opinions.
You can prefer the Whitebeard/Roger Cuts in 965/966 over any single individual scene that occured in this episode. But claiming that either of these episodes were animated better in their entirety than 1015 is simply wrong. On Sakugabooru you can see the cuts per episode.
If you want to compare the
quantity of "good animation", then Episode 965 had about 1.5 minutes worth & Episode 966 had ~2:15 minutes of "good" animation.
Episode 1015 had over
17 minutes. The difference is tremendous.
Obviously the quality of the cuts matters more and we can agree/disagree about which cuts we put over another etc. like i said previously.
Sakugabooru also has a rating system for what it's worth where you can give each cut 1-3 points if you either find it good/great/amazing.
The highest rated one from 965 is the WB/Roger clash with 1070 point atm. 2nd is Roger crew vs Whitebeard crew from episode 966 with 884 points currently. 3rd is Red Roc with 845. So you could make an argument, that these other 2 cuts individually are generally more well received. On the other hand, Episode 1015 only has been out for 2 days, while the others have been out for over a year, so the score of Red Roc and all other scenes of 1015 are likely to increase as well a bit more in the coming days & weeks.
I'm a fan of statistics and metrics, so felt like i should mention that.
Big disclaimer though, we are talking here about
art & animation so just because one cut has a higher rating than a different one it shouldnt be looked down upon or something like that. And comparing scores between different series is also dumb. There are some amazingly animated shows that simply are not mainstream like One Piece which is why they barely have a high score.
I would generally only compare, if at all, scores of cuts from the same show
Might have went a bit overboard with this essay but at the end of the day i just want to say:
Sakugabooru Rocks
Episode 1015 Rocks