Ruger® Mark III™ Target Rimfire Pistol Models
Ruger® Mark III™ Hunter Rimfire Pistol Models
Laser Sight For Ruger LG-403 Front Activation | Crimson Trace Laser Grips
Not much difference IMO. Yes, there are a few things, but its just what you'd like your gun to have on it or length of barrel. I'm confident that they would shoot equally well.
I have a set of Crimson trace grips on my MKII tapered target. I can still see the red dot on a target at 25yards at noon on a sunny day all though I might have to really look to see it. Any other type of lighting and its no problem to see the dot even at 100 yards, no problem. They're fun to play with but thats about all because you can't use one to hunt with. I'm not sure if it comes in green or if another brand makes one in green. I've also read that the green lasers are much brighterin the day.