Both, but usually I like ukes the most. Idk I want to protect them.
Personally I like the "Puppy personality" in ukes and semes, i love characters with this kind of personality (Shuichi from Gravitation, Gaku from Sukisyo, Morinaga from Koisuru Boukun, and probably Nowaki from Junjo Romantica enter in this category).
But I also like the inexpressive type like Noiz from dmmd or Nagase from Sukisyo >_<
This is sooo embarassing but I like i prefer seme characters bcuz i feel suuuuuper like an uke LOL LOL LOL
Like, most of my favs I think you could qualify as semes, or at least I think of them as semes in their relationships (worth noting i engage in a lot of not canon yaoi shipping), and I think it's cuz i like the thought of them protecting me teehee :3 :P
personally, i choose neither. i know theses tropes are important for some stories, but i like it more when characters the characters are just themselfs.
i tend to care more for ukes, i like harem ships so i'll just invest on one uke to pair with every man on earth lol, but honestly if the seme is cute enough I'll put more attention to them, OOOR if they have a weird psyche but thats just general character pref jsjs