>>64114992
I like them both
The compelling things on the 17 are the barrel, and being slightly lighter. I don't like the rear screws being a limiting factor for using alternatives like the ACR stock, so I've left mine unmolested
The XCR just feels solid. I've designed a wider cheek piece that is more comfortable and consistent cheek weld between prone/offhand, similar to ACR width, but entirely flat. The bolt catch and charging handle are a winner, IMO