I own both. I will be keeping my XCR and selling the Tavor once I get a RFBc. I like my Tavor, but because of a few things I prefer the XCR... I really like the 6.8SPC and it's turned out to be 1.5MOA in my XCR, so I plan on using it for hunting. The ergonomics are really good on the XCR, the Tavor shoots gas in my eye when shooting, the trigger is HORRIBLE on the Tavor. Cleaning the XCR is much easier than the Tavor. That being said, I still LOVE my Tavor and would love to keep it, but the boss (read:wife) says I can't order a Sub2000, an RFB, a Henry rifle and a Taurus Judge without selling something.... so the Tavor gets the ax as it's really the least useful for me as I can't use .223 for hunting in Saskatchewan, and for volume shooting my 858 is much cheaper to shoot....
For some reason some people are really down in the XCR, but I love it. AR ergonomics (maybe better) but non-restricted and in several calibres. I do wish you could get a lighter barrel for it as being only able to get the heavy barrel is a downer. In particular I can't say enough good things about the 6.8 SPC cartridge. It shoots wonderfully, hits hard and is accurate. If you do get an XCR, for 700 bucks later you could add a more useful hunting calibre. If you hunt that's a major advantage.
2 cents contributed.