I agree with SVT. HT is the way to go for our area.

I have found that on my 29er, I roll over stuff more easily and the big wheels mask some roughness that you might feel on a 26er. I feel like I am faster on my 29er, but that might be because it is a singlespeed. The maneuverabiliy isn't as good on the 29er and I have found the bit heavier wheels make a difference when pulling the front end up (could be my womanly wimpy upper body strength). The 26er is more lithe and agile. The 26er is more responsive when turning and cornering. It seems to take slightly more energy to get the 29er rolling as compared to the 26er, but the 29er momentum when rolling is beautiful. Test ride both sizes, see how they fit and feel. That's your best guide.