DBZ US vs DBZ Japan... there's no comparison honestly. The US version is quite a bit better. The recently released recuts are a lot better in terms of voice acting, and the US DBZ OST is so much better. Bruce Faulconer is fucking amazing. Most dubs I've heard aren't usually all that bad,
Oh my god yes, Bruce Faulconer's music is AMAZING, so much better than the original japanese music. I was nearly heartbroken when i bought the DBZ collection and it had 'revised audio', which i found out meant english dub with japanese music. Thank god i found out that you could change the audio back to US broadcast stereo, meaning it had Faulconer's music.
Where you're watching some epic fight scene classical style music with trumpets and stuff just doesn't cut it...
Also, DBZ funimation dub is the only way to go, Ocean group's isn't as good.
I've never watched an english dub with bad lip sync (not that I've watched a great deal), I've actually seen more unsynced japanese voices than unsynced english dubs. Also, as i said, i usually find the japanese voices to be the terrible ones.Also a lot of the dubbing sounds incredibly immature or has poor lip synching or just terrible accent.
I mean, again using Dragon Ball Z as the example, compare:
Japanese:
(skip directly to 10 seconds in for goku's voice)
(and 39 seconds in if you want some further ear-rape from gohan)
English:
(for the exact same Goku yelling bit skip to 20 seconds in)
(and 44 seconds in for the same bit from gohan, this time without the ear-rape)
English dub is by far the better of the two (In this case. Having not watched every anime out there i can't exactly vouch for all of them)