I had the ram mount X-Grip, but three things I found a bit annoying when using it a lot. First the rubber harness required for a full hold on the phone was more work than I wanted and looked ugly when no phone was in the mount. The second was that the X-Grip always hit my volume and/or power button on my iPhone X and previous iphone 7 plus. The third thing was that I couldnt quicky take my phone out and put back in with one hand, especially when using the rubber harness.
So, I switched to the Quad Lock, which resolved the above issues. If you decide to go that route, they have a referral program, where you’ll get 10% off your order and I’ll get 5%. This is the referral link they sent me after my first order with them:
http://quadlock.refr.cc/JFWK7LB
Either way, good luck with whatever you decide to go with! Anything’s better than just having your phone in your pocket.