For my own personal use, I prefer more rounds in the mag over power. If my aim is arthritically off, I want to be able to correct for a miss. The Thorn looks good to me because of the internal damage that it does. Then again, Last Word can stagger an opponent, which would also give me a chance to correct my aim. Then again, the Thorn has low recoil, which could make one less round in the mag not much of a factor. Hmm. I have neither, but would probably tend toward Thorn because that thing just looks so damn cool...