Easy answer to the original question. The SR-22 by a huge margin. Non-restricted, and available high-quality, high-capacity magazines which in a rifle like this is a must. Neither of the competitors can offer this combination.
lol of course you say sr-22, your name is rugerfan....
most people touched on this already: 1st decide if you are ok with restricted (seems like you are), but if not that eliminates the M&P 15-22.
the sr-22 is the same mechanism as a regular 10/22, just dressed up as an tacticool AR, so really like someone suggested, you can get the target 10/22 and be a bit more accurate.
on the +, it feels solid, has 10/22 reliability and accessories
havent touched or seen the remington, some love them some hate them and say reliability isnt the greatest.
the M&P 15-22, is most like an AR in looks and function (charging handle, bolt catch, mags of similar size, breakdown, etc) so it would be best as a trainer or alternate to a real AR and cheaper to shoot and is a fun plinker, so for those reasons I bought the M&P 15-22, but of course your needs might be different.....