To a very large extent, though, there are obvious differences -- I usually dislike a high whiny male emo voice (and I actually think that both MCR and FOB have found ways to "clean up" their voices along with their songs), but then when a woman sings similar material (cf. Paramore), it really hits. Sometimes you can write things off (somewhat) as a general taste difference, though there are always exceptions, and often the more interesting facets of taste happen in the "exception zones." Like what sort of emo do I like? How is it different from the stuff I don't?