Get whatever one you feel more comfy with. You obviously are going to go to that as a first line of defense, so practice, practice, practice. Shot placement is everything, and once you can consistently hit a 15" ball bouncing down a 45 degree embankment then you're halfway there. For a shooting under pressure exercise, have a friend stand behind you and crack the back of your legs with a bamboo cane every time you miss. Gets the heart rate up in a hurry.