I've got both types and neither is perfect. The biggest drawback to the Lasermax, and the one that the company doesn't bother telling you, nor is it mentioned by any of the gun writers is that they are not made to work with speedloaders. Yes, you can modify your grips to accommodate a speedloader, but then you void your warranty. Now explain to me who the rocket scientist was that made that decision??? Also, the laser can be easily and inadvertently activated by accident while your piece is still in your pocket or holster. Lasermax took this into consideration though, and the unit will automatically power down...after 30 minutes. Yeah, you can go through batteries pretty quickly if you're not careful. Also, Lasermax does not have the best customer service - at least in comparison to Crimson Trace.
According to the company, they have no plans to make grips for any other frame size in the S&W line. So, if you want laser grips on anything other than a J frame, look to Crimson Trace.
I do have Lasermax grips on both of my J frames (432 PD and 642). My 642 has been modified to take moon clips, but they hang up on ejection thanks to the Lasermax grips. What I've taken to doing with the 642 is to load and carry it without the moon clip for the initial load, and carry the reload in the moon clip rather than a speed strip or speed loader. Despite its drawbacks, I find I can get fast and accurate shots off with both of the J frames using the Lasermax grips. You gotta take the good with the bad sometimes.
Best of luck,
Dave