I went to a show and compared them at the demo booths hands-on. I chose the Jointech although I wouldn't hesitate to own the Incra. I have an Incra 1000se miter gauge and like it.
There are a few things that sold me on the Jointech. First, I preferred the fine adjust for the stop on the Jointech. Second, the scale remains accurate with angle cuts. The Incra must be readjusted (not that big of a deal really). Finally, and probably most importantly, I just preferred the feel of the Jointech.