Yes and no, the two answers are linked.
First yes, because Oda is using most of times previous ideas or the same structures. Post skip is not at the same lvl of pre skip. Just watch end of TB and end of FMI, Dressrosa or even WCI .. TB we were like "omg what's gonna happen ?"
But those arcs, we were like "just finish it" it's predictable ... i think the lenght of OP is really difficult to maintain so even Oda has lots of trouble.
No because all the mangas people gonna say "it's better than One Piece" have a lenght of 2, 3, 4, or 8 seasons. They are not even weekly.
If you really want to compare, bring us a manga who has a weekly release for 23 years, a world build like One Piece, who has so many theories, so many characters and so many arcs and twists. Even one page in One Piece is amazing with the amount of details. One Piece is a network and that's fucking amazing for a manga.
No one ? You know why ? It's impossible to create a manga like this.
Mangaka usually limits the numbers of theirs characters or arcs because it's too hard to draw and give a story for each of them. Most of panels or pages are empty. But Oda still creates stories for even side characters and probably still has many ideas for One Piece.
If you want really to compare. Just remove from the manga one piece all fodders, useless lenght and stories, arcs which are averages. But only with good moments for a lenght of 500 episodes. Starting from Luffy meeting Alvida to luffy becoming PK.
It will be the greatest without any rival.
Easy to say any manga is better than OP but imagine Shingeki no Kyojin for 900 episodes for example. it was possible when you look the hype and fame but the author couldn't because he has nothing more to add or say. That's why you can't compare Oda to anyone.
Berserk ? the only one i could accept to compare but still no ! why he started at 1989 but it's only 40 tomes and +300 chapters.
The author of berserk has so much time and it's monthly release. Not comparable.
99% will be lost if they release their manga every week.
Only because a manga is running for so long doesn't mean it's the best. One Piece has one of the best world buildings in all of manga, nobody denies that. Yet you already outlined one of the stories biggest problems: It has become repetitive, especially post-skip.
The formula for literally all OP arcs is the same: Sail to a new island, meet the nice guys (most of the times a lady), hear about their problems and the bad guys, flashback about the tragic past, defeat the bad guys, have a banquet, repeat.
Make no mistake, OP is still good and a fun read. I just can't put it anywhere near some of the mentioned mangas (HxH, Jojo, Berserk, Kingdom) when it comes to storywriting.
Don't read a lot of manga but from anime I'd say Full Metal Alchemist, Demon Slayer, My Hero Academia are better than post TS One Piece.
For manga I like Kingdom more than post TS One Piece.
Beserk is probably better than any version of One Piece
One Punch man is a good contender as well.
Well, let's not start with the anime, honestly. The OP anime is a massive shitshow, let's call it like it is. Animation quality is beyond horrible at times and the pacing is atrocious. The Wano arc has been fine so far, but it's the first solid anime adaptation in more than a decade.
No sane guy, who isn't a hardcore One Piece fan, watches 120+ episodes of the badly animated Dressrosa arc.
I could list at least 100 anime adaptations that are better done and it's not even an exaggeration (reminder: only the adaptation, not the source material).