Yes I think Alyn is most popular, along with Byron and Louis. I haven't played Byron but Louis was great, he seems like the "canon" choice if that makes sense.
I also played Rayvis, Nico and Albert and although they were all nice, none were anything special, to me at least. Well I guess Albert was the best, I wished they had made him more shy so you can tease him, then he would have been perfect.
Err, sorry for rambling about them, in any case I would recommend Louis or Alyn, although many people say the main character is too passive in Alyn's route but I never paid attention to that (how could I when I'm busy looking at his beautiful face??)