Purely anectodal, but Greenpoison's probably more stable. When resetting the springboard with Limerain, the little "loading circle" would always overlap with the apple logo. My iPod was also stuck looping that screen so I was forced to restore it and re-jailbreak with Greenpoison instead. Also little other things with Limerain like going into iTunes and having all the apps not inside of folders in the App Sync screen.