Most importantly the wife needs to feel safe and secure so the stand needs to be solid.
Only you can provide that feeling. The best stand on the market isn't worth a hoot, if you do a half-hearted job of putting it up, and attaching it to the tree. The brands listed above are good stands, but only as good as the installation.
I'd get a couple extra rachet straps and be sure you have it tight on the tree at the seat. Get the "feet" for the bottom of the ladder so it doesn't sink into the ground.
