The clearest match I found is a Chess.com forum post where a user says, “Every experienced player knows that the dark squared bishop is always better,” but it does not identify a famous player by name.

What this likely means

That line appears to be a forum opinion, not a verified quote from a top player. The post mixes serious chess discussion with joking and argumentative replies, so it is not a reliable source for attributing the statement to a specific grandmaster.

Best guess

If you’re asking who popularized the idea that bishops matter a lot, chess writing often discusses the value of the bishop pair and dark-squared bishop in different openings, but the result here does not show a definite player attached to that exact quote. A name cannot be confirmed from the available evidence.

TL;DR

No specific player is confirmed here; the strongest match is just a Chess.com forum commenter saying the dark-squared bishop is always better.