Some voice overs for immersion are cool. But lots of text for different dialog-options are cool, too. I hate to see only <=4 dialog options, because more would be too expensive to make with voice overs for most devs.
I like the important stuff to be voiced, but the majority to be text, so that the writers can be more verbose and descriptive without impacting the budget.
Voted both.
In Shadowrun, the utter silence of every character really bugged me, considering that the game had lots of little sound-bits/effects thrown in and nice background music as well. Giving a bunch of characters a voiced dialogue starter like: "Hello!, Greetings!, Fuck off!, What'll it be?", would have gone a long way.