Better...hmmm its just better for me and better on how I sense it around me. And I think once its done it will leave the biggest impact on the after generation than any anime show ever. But you are right too, that is also something I tried to tell when I mentioned that Demon Slayer is the closest competetor. Because it does something different and does it better. Same arguments can be thrown at Bleach, Naruto, MHA, Black Clover, JJK and Chainsaw Man.
I agree with that. Whoever has been in Japan has seen the huge impact One Piece has had on pop culture that frankly was not seen before in manga land. Dragonball had a huge influence as well but it was not remotely as widespread as One Piece, though the newer generation has moved to newer things for now.
Just saying that cultural impact does not necessarily have to correlate with being better.
Shounen off the top of my head that do particular things better than One Piece:
FMA - much tighter and well thought out narrative
SnK - Danger actually had consequences
HxH - much better powersystem and intellectually more satisfying for the most part
Slam Dunk/Beck/Eyeshield 21 - Much more satisfying hero´s journey
In turn OP really excels at two things: World-building and incorporation of themes. That´s why i will always rate OP high despite its shortcomings narratively, but at the same time can say there are other titles that do certain stuff better.