I agree with the faster on a bucket table. Tighter tables are often too EASY in an important respect; your mistakes get a free ride too far into the game.It makes zero difference. A player will improve the same on a bucket table or a tight table. I'd even venture to say they might improve faster on a bucket table because they can be more aggressive with shotmaking and position.
Imagine two 500s playing on a tight table.
Most of the time it doesn't matter if you choose the wrong suit.
It doesn't matter if you choose bad patterns
It doesn't matter if you play crappy safeties
It doesn't matter if you miss
It doesn't matter if you miss two-way shot opportunities
This is because the table is tough for your opponent too and he is unable to punish these mistakes until late into the game. That free ride for your mistakes slows learning for you.
On a table with bigger pockets, that 500 opponent punishes your mistakes better. And that's good for your development. You're playing pool more like good players play it.