Judging by Josh Ricci's measurements of both, I'd probably lean towards the SVS.
My reasons?
For starters, the EQMax15 is really only delivering solid output down to 32Hz. After that, it's dropping like a rock and the distortion is going through the roof. I mean, at 25Hz, it can only put out 95.7dB with 26.2%; the SVS is delivering 105dB with 9.2% distortion at this point. I think its fair to say with movie special effects, there's going to be a pretty big difference.
Second reason: bandwidth linearity. Even at its limits, 6.4dB separates the maximum output from the minimum output from 20Hz to 120Hz for the SVS. The Velo on the other hand slightly exceeds 10dB from 32Hz to 120Hz (the SVS varies less than 4dB in this band), with a big hump centered at 63Hz. IOW, if you're pushing things hard, the SVS is going to sound more even and consistent, versus the peakier Velodyne.
Now don't take all of this to mean I think the Velo sucks. It delivers considerable output from 40Hz to 120Hz with remarkably low distortion and great decay. If you were strictly using it for music with little content below 40Hz, it seems like a good choice, and if you don't happen to be using a newer receiver, it's auto-eq would give it a useful advantage over the SVS.
However, the SVS is still capable of delivering respectable, if not earth shattering output, anywhere from 20Hz to 120Hz with fairly low distortion. I think it amazing that it ran through the 105dB level compression sweep with less than 5% distortion from 20Hz on up. About the only negatives it has are its group delay and decay rate around port tuning (the audibility of which is debatable) and its relative simplicity versus the Velo.
Edit: One last note: probably one of the nicest things about the SVS is that it is a truly bulletproof subwoofer. You won't really be able to make it misbehave. Reading Josh's notes, that doesn't seem to be the case with the EQMax 15.