The AR is more accurate, so if you want to shoot little brown critters way out there or other long range stuff, go with the AR. Keep in mind here I'm talking about groups of 3"@100 w/the M17 instead of .75 w/the other. If this is not a big deal, and you just want combat accuracy, the M17 is fine. It's cheaper, easier to work on the trigger, cleaner, and when you punch holes in the reciever, or drill and tap, you can attach any accessory you can think of. The trigger needs a lot of work, but it takes 30 seconds to pull it out. The scope rail/carry handle will need to come off, but you can tear this rifle down in 5 min. It only gets better with a muzzle brake(try a JP)expensive but worth it when you can fire pairs at 50 in under .75 seconds and keep em in 10 inches.
I'd go for it. I was not disappointed. You won't be either if you buy it understanding it needs help. But that's a lot of the fun!