While I'm no expert Arborist, I would think theres advantages and disadvantages to both. I do know about Boom lifts though.
Boom lift your going to have to trailer it everywhere, the truck just drive it.
Boom lifts with reach capabilities under 128 feet usually don't have out riggers. This is a pro and a con. Pro: you can be 128 feet in the air and drive the machine around if its not quite in the right place. CON: you have to operate with in a certain grade slope.
Boom lift: your not going to rig anything for lowering of the boom. Most booms, like Genie, JLG and Snorkel have limits of 500 pounds, theres a few with ratings of 750 pounds.
Then you get the choice of either a straight boom or an articulated boom.
Straight booms 80 feet and under you can extend out the whole way and swing up, where as a articulated boom like a Genie 60/34only has 34 feet of outreach, but you can wiggle a Z boom into places you can't get a straight boom and operate in much tighter confines.
If you do buy a Boom stick with the big 3. Genie, JLG, and Snorkel.
Whatever you do, DON"T buy a Condor. COndor used to make production changes as they where rolling down the assembly line. They where the most miserable thing to work on.
Markklift isn't too bad
IF you want the best customer support buy Genie and be one with it. It's also the Caddy of booms but worth every penny