I've got bikes with 26x2.35 and 700x40 and 700x23 and I prefer the 26x2.35 tires for commuting. The acceleration is horrible because they weigh a lot, but once I get them spun up it's like a rolling freight train. I can roll over everything (sticks, glass, grates, ruts, rocks) and not have to worry about it, and the small loss of speed is more than worth it for the comfortable ride.