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.