Ladders all the way, I've sold all my climbers/lock ons, etc... and bought and continue to buy ladders.
I have 1 nice climber just in case, that sits int he garage or truck and never gets used.
as for mobility, 2 guys can move/set up a ladder in no time, and mount to almost any tree, vs. a climber must use a straight tree, it's hard enough finding a nice tree for a ladder let alone a perfect tree without branches for a climber... in the spot/near the spot you want to be.