More companions sounds good to me; I would gladly pledge more for that. I know you guys are focusing on making each companion amazing and integral to the experience, like in Torment, and that this is time consuming, but the current amount of companions (8, I believe) doesn't feel like enough considering you can recruit 5 total companions. It feels like there should be at least 10 companions, but maybe a couple more to round things out, so 12 would be perfect to me. More than that is even better, of course. A lot to ask, I know...
More wilderness would be cool, but I'm not sure. Baldur's Gate 1 was an amazing first playthrough for me, but I noticed that subsequent playthroughs often resulted with me ignoring many of those wilderness areas. I would love to see them in the game, but I think companions would take a priority for me.
So companions > wilderness for me, but I'd go for both.