The orange plastic throwers work the best in my opinion.
I have a green, single step thrower that I got from Fleet Farm a few years back. Don't know the name, sticker wore off, but is works good. Don't get the kind you have to cock by hand, you will hurt yourself at some point. The kind you step on and it cocks with the force of your step is the best. But all of these will throw in the same place each time you load the trap. Your buddy with a hand thrower and a couple barely pops in him will make for much more challanging shots.