what do you mean you "need" to drop 1? Did you make a 1 for 2 trade? Or is there a FA you want to pick up?
If it's a 1 for 2 trade and you absolutley have to drop one, I'd drop Green.
But if you are just thinking about dropping 1 for a FA, I'd really consider who that FA was and if it was worth it.
Green should have decent value with low end pts, nice 3's and steals. While Leonard should turn things around and have higher end pts, steals and 3's.