^This
I mean, honestly, unless there was some sort of law for voice actors that only allowed each VA to do one type of animation, I would love to expand my horizons, and try all different sorts of shows from different countries (and yes, I would also be interested in trying to dub other animated works that were from other countries besides just Japan).
Thinking about it though, as hard as it must be, I have always really wanted to try voice acting. I probably wouldn't be very good at it, but like many things, I believe with a matter lots of practice and experience, I could become good at doing certain roles that my particular tone of voice would fit.
That said, if I absolutely HAD to pick one, it would be a tough choice, but I believe that I would prefer to do American animation, then, simply for the fact that it would feel a bit more interesting to be the person who gives a character his original voice, which in essence would be helping to craft that character in the way that viewers would perceive him. If I did a dub of an anime, as much as I would want to do that, it wouldn't feel the same, as I would simply just be dubbing over the original voice of the character, and many people would still probably perceive the character the way that the original voice actor portrayed him, instead of how I would have. And, even if my portrayal would match that of the original, the way most people saw the character would still be because of the original, rather than me, which would make my voice acting feel somewhat pointless. Still, it seems as though it would be fun and interestin to do.
That said, I am, obviously, not a voice actor, and most likely never will be, as I don't think that I'll ever have the time to try it out, especially since I will only be getting busier with my major, as I progress to my later years of college, and get even busier when I finally start my actual career.