There is no best indie rules system. PbtA, FitD, BoB, FtQ, Fate, Genesys, whatever. People can like different things, that's the amazing thing about indie rules systems.
Just because someone likes a thing doesn't mean they don't understand it.

I like PbtA moves. I know they have strengths and weaknesses. They play games the way I like them. Games with (narrative)(mechanic)(narrative + mechanic) WORKS for me conceptually.

Now, that doesn't mean you can't dislike them! Those strengths may not line up with what you like and the weaknesses may be game breakers (lol) for you. But if we put those systems against each other as "this is good and this sucks," we weaken all of the games.

And frankly, the different rules systems do different things. I've seen a bunch of times things that imply that BoB is the advanced form of FitD which is the advanced form of PbtA. That basically you shouldn't make PbtA if you can do one of those newer, better styles!

But those games are DIFFERENT.
The tight scope of PbtA isn't a flaw, it's intentional design.
The skill system of BitD isn't a flaw, it's intentional design.
The flexibility of BoB isn't a flaw, it's intentional design.

Even if you have the same theme and share a bunch of mechanics between them, those games will be different and that's okay!

You should make and play the games you want to play! And that rocks!