As has been almost "hinted" to here a few times, the big difference between the bushnell and the pocket radar is the "line". The bushnell is fine if you're perfectly in line with the pitch or hit. The pocket radar is better, IMO (as I have both) standing behind the fence and measuring the girl/boy pitching, Both will be off if you're holding it at 0 degrees and the ball is hit at 45 degrees or thrown at a different angle than straight.
There's also another BIG thing... resale value. Once you're done with it, the Bushnell will mostly be worthless. The pocket radar will sell easily. Maybe a moot point for some, but I know that my Bushnell will continue to rot at the bottom of a pile of baseballs while my pocket coach radar will sell within a day if I put it up for sale.
Have you done a side-by-side comparison? Do they give you the same reading? Is one showing faster/slower than the other?