The VizBigs are very good releases, yes, but the Dragon Ball ones are visually censored.
I noticed more dialogue censorship with the Z VizBigs (for example, when Raditz dies, in the tankoubon, he yells "Damn you!" and the VizBigs change the line to "Curse you!")
The VizBigs do, however, fix many translation problems.
If you would like to see a more detailed comparison with the U.S. tankoubon releases, refer to
my old thread.
All in all, yes, by American standards you are making the best choice regarding manga that is currently available.
