Now, I'm not the most experienced shooter here, but my two cents would be handling them and deciding which you like better based on feel and features such as mag type(detached or not) and bolt lift.
I have sold at least two rifles in the past year or so because of a combination of these factors.
I have kept my x-bolt. Now, I don't have experience with the 700, they probably shoot very well. Some of them look decent, and some of them have butt-ugly stocks. I'm partial to wood stocks in general though. The 700's I've handles have all didn't feel very quality, but they were the lower-end sps models.