I don't know if you're still researching this, but if you are, I have some experience with both brands. I bought a Summit Bullet Backpacker a few years ago - it was my first tree stand. IMO, the Summit is too heavy, too bulky and requires too much assembly/disassembly to get it on/off the tree. Because of these issues (mainly the weight issue), I sold it and bought a Lone Wolf (LW) Alpha Hand Climber in October. Yes, the Summit was more comfortable than the LW, but what the Lone Wolf lacks in comfort it more than makes up for in weight, packability, ease of use and huntability (again, my opinion). In addition to the weight and ease of use issue, I don't think I hunted as effectively out of the Summit as I do the LW. With the Summit, I always felt like my ability to watch 360 degrees around my stand suffered because it wasn't very easy to move around on the seat to see what was behind you. The LW, allows you to change your seating position (left, right, up and down) very easily so that you can see what's going on in all directions. I guess the analogy would be sitting in a lazy boy versus sitting on a bucket. If I wanted to watch football or take a nap, then of course I'd take the lazy boy, but if I'm hunting, I'll take the bucket every time.
Last thing... I did recently spend about 10 hours on stand using my LW and it really wasn't that bad. The seat is stiff with not a whole lot of padding, but whenever my butt fell asleep, I would get up and stand for a while.
Good luck.