Hi Timothy and welcome. The differences will be thumb safety and non thumb safety and /or 10rd vs standard capacity magazine differences. Just check the upc code to find which configuration you like best. Cheers, stay safe and enjoy!

if you gave us the 3 models we could better answer your question. S&W has 7 variations of the M&P see smith-wesson.com/products/pistols?caliber=10MM&barrellength=4 variations include safety/no safety, sights/optics, capacity, color

Good afternoon to you!! The difference in the models usually are tied to stock and UPC numbers. Visit S&W website as Ed C suggested and see which UPC and model number you want. Hope this helps, have a good rest of your day.