check the weight of the stand and how compact it is when its folded up. Comfort is also important so pay attention to the sze of the seat and how adjustable it is.
my idea of an ideal tree is one that is about 16 inches in diameter at the base. the bark needs to be somewhat smooth so the straps wont catch on it as you climb, but not so smooth you have to worry about the stand getting a good bite into it. Poplar is my favorite as far as bark. I like to hunt about 20 to 25 feet up, so I like to find a tree that has a couple limbs in that area. When iI get to the limbs, i unstrap the top part of the stand and restrap it above the limbs. That allows me to get up into that much cover anyway. A slight lean in the tree, away from the direction you are facing helps with the comfort factor as well.
just keep in mind that the tree gets narrower as you go up. So at the base of the tree, put your platform on tilted back. That way as you climb and the tree gets thinner, the platform will level out.