I, like many others, own both now. Open Shot Summit and lone wolf hand climber.
Summit is more comfortable without a doubt, but weighs more--and is much more cumbersome getting in and out of the woods.
Lone Wolf folds flat, and is much lighter, though harder for me to climb with without the additional length of the rails.
I'm hunting exclusively out of the LW for this season--but I bought a new seat for it (Fat Boy) and hopefully it will do the deed.
BTW, I bought the LW used online for less than the new open shot so it can be done.
Good luck with choice--you really can't go wrong.
Josh