1. Out of the original Jap version and English Dub which do you prefer?
Neither. The Japanese version is generic and predictable. The English version felt like it was on restraints (i.e. lip sync). But, chances are I will side with the English version if it improves in someway. Though, I think it was trying to make some sort of illusion to a live action movie or something. Doesn't help when the lip sync comes flying off.
2. Are there any Voices that you were unsatisfied with (either Jap or English Dub)?
Takahiro Sakurai came off as one-sided as Cloud. Too stoic. I couldn't tell whether Cloud reconciled with himself in the ending, without the sappy music or visual aid around. I like Sakurai in his other works. But, his Cloud is just boring, too restrained, save for a few yells and stuff. Mena Suvari in the English version was pretty flat, too.
The rest of the voices, I'm fine with. Steve Burton, George Newbern, Andrea Bowen, Rachael Leigh Cook, Benjamin Bryan and Rick Gomez, especially. Kadaj's and Rufus' Japanese voice actors, as well. Though, the former's actor does a good job, too.
There. I said it.