do the majority of the americans prefer the english soundtrack?
It tends to be split. There are plenty of people that go by subs only, but I hardly ever hear of fans going dub only. Really it just depends on the two casts for each series.
I'm usually swayed by 1)which language I hear it in first, 2)cultural setting of the show, and if one cast just seems leaps and bounds better than the other.
Examples:
-Samurai Champloo I ought to watch in Japanese due to rule 2, but I saw it on the air first in English and grew too attached to the main cast. (Plus I avoid the copious amounts of Engrish present in the show).
-Black Lagoon is set in Thailand, and while the male lead is Japanese, the rest of the main cast are American, (and extended cast of characters are largely not Japanese speakers), so English makes much more sense.
Anyway, to keep it on topic:
Brett Weaver (Nabeshin) and Jessica Calvello (Excel) are my favorite from the cast
I could listen to both of them all day.