OOH! tough call. I currently own both. I play with my shocker more because it fits me WAY better. Although I've found that with the m3 the dm4 does appear to be a bit faster. With a DM4 your gun will not "need" any upgrades because it's good to rock and roll right now out of the box. After I bought my shocker I shelled out an extra $250 buying all the NDZ stuff, which REALLY improved the marker. So odds are you going to spend about as much on a DM4 as you will a tricked out shocker.