I enjoy Astarion. I like all the companions, but seem to prefer Astarion, Shadowheart and Gale.
I actually can get where Astarion is coming from with his feelings about the tadpole. And I like his backstory. My cleric is quite smitten. Sadly Astarion turned him down, my first walkthrough.
I think my least favorite is Wyll. The blade persona wears me out. But I don’t hate him. I just tend to leave him in camp a lot.