Argyle King
Legend
Reasons?
Anecdotally, I've had a lot of negative experiences with problem players gravitating toward changelings as a way to be annoying and disruptive. The worst experience was with a DM of an Eberron game over-using changelings as a gotcha moment. "No, it actually wasn't the BBEG, it was his changeling servant!"
After already having a negative bias burned into my brain, further thought makes me question how a setting (Eberron) with political intrigue can function when potentially every social interaction could mean speaking to someone different than you expect. For similar reasons, I'm not enthusiastic about shapeshifters playing a role in upcoming Marvel movies.
Drow - I don't have anything inherently negative against them. Palette-swapped elves just isn't enough of a concept for me to get excited over.
Triton - I picked a third one to mirror my 3 picks for favorites. I've never played a triton character or had a concept to which being a triton seemed necessary.
My 3 favorites are half-elf, tabaxi, and lizardfolk.