Real World Experience. I am running a 2x10 SRAM setup on my 29r, and a Shimano XT triple on my 26r. So a direct comparison is not easy. However, here is what I have noted, and a lot of it has already been said. Most critically. ALL combinations you have on a 2x10 are useable. I.E. no funny angles of the chain. The biggest thing that you need to get used to on a 2x10 is making sure that you preselect your gears well, and read the trail well. the last thing you want is to be in the wrong gear before a change in terrain, especially with only a double up front, and having to move through 10 ratios at the rear, to get an easier gear. 99% of the time is spent in the big ring. The granny, is still a real granny gear. The result is; you're invariably, not going to drop to granny, you're going to stick it out in your 39, so you need to shift fast at the rear to maintain an easy stroke. Make sense, I hope? I firmly believe a 2x10 is great on a 29r, when you've got epic amounts of momentum on your side. I think on a 26r it may be tougher. I do not know what your torque outputs are like between the two groupsets, I suspect a triple may allow the average rider to extract the torque better? A Skilled rider will be able to extract similar figures from a 2x10, luckily, i have rolling speed to make up for a lack of skill!
