Both are great gliderwise ;) Personaly, I would lean more toward the tall one to leave more space in the room for out of cage time, but that really depends on your setup.
@ BYK_Chainsaw : That's a nice playroom!
Here they also used to spend quite some time at the bottom half of the space available in the room, but this changed when I added some solid vines on the upper half. Gliders can't really jump from fleece items because it doesnt offer enough rigidity (they can only climb, run and jump to them), so they prefer play with toys (which are near the floor level) instead, a flew fleece ropes are nice climbing toys though.
one question, the mesh sems quite wide, don't they pass through it?