For the price the AR332 comes mount ready, so the cost of buying a mount or rings for the DMS may be higher.
I have the AR332 and quite like it. The reticle is permanent in black. You can illuminate it to either green or red in various brightnesses, where the illuminated horse shoe acts just like the circle of the DMS. The difference from 3 to 4 power isn't really that much in total difference. While the illumination gives you that similar donut of death for fast aiming, you still get the aim off marks for distant targets out to five or six hundred should you have the need. I really like it, it is a very nice overall package without getting into the two-way firing range prices.