I always like Japanese versions the best. The voice actors sound much more.. fitting. But for season one eng dub, the dubs weren't that bad. Oh, and Sebastian but I think I like Alois better than Ciel. He's more playful and Ciel is more serious. x'D
I have always preferred the subbed ones and always will. I love Sebastian and Ciel the most but Alois was just... Idk I felt sorry for him in the end and honestly I only watched season two to see what it was like. I prefer the magna. Though the ending with ciel was interesting.
I do like the dub version the best because I can understand the story a lot better. It's pretty much that way with every anime I watch but I still watch subs but in this case english dub. The only problem to me with the dub version is that Alois sounds a little too much like a girl I know Ciel was that way too at first but I think the voice actress' young male sound improved throughout the series and she started sounding like a young boy. Basicly what I'm saying at first ciel didnt sound too much like a girl but alois did. Well despite that i still like the dub version best.