I heard that the cell radios in motorolas were better, looks like the gps radios are, too? Is there somewhere that I can get a comparison?
Not of which I'm aware.
You could post a question to maybe the General News & Discussion forum, asking, for example: "If you had other cell phones, used the GPS a lot, replaced the phone with a Motorola or Moto X/G/E or whatever, did you notice an improvement in GPS performance?" or the like.
I simply read
lots of reviews of the phones I was considering. Noticed mostly either no particular comment at all, or "meh" comments, regarding their GPS',
except for the Moto G. For the Moto G I found highly positive comments about the GPS' performance. Between that and Motorola's reputation for good radio hardware (the GPS receiver is, of course, radio hardware): I came to the conclusion the Moto G's GPS was bound to be superior.