I was looking into these a couple of weeks ago and found this video review. This guy says that the Drive Reach is the newer model and is better than the Drive 4G-X. The Drive reach does not come with have the OTR antenna, but he does say it's a must have.
Anyways here's the video review.
WeBoost Drive Reach: 7 Things You MUST Know about this Cell Phone Booster - Does it Work? - YouTube