PBR is made up of franchises. While very good, they lack consistency at the national level--because you'll find they all run showcases a bit differently with different people running the show. So to answer whether they use a laser-timer--don't know but not likely--our local (state) PBR does NOT. Of course PBR Future Games is a bit different--that's a national-level showcase and you DON'T want to miss that if ever invited.
But if you are interested in getting numbers posted locally or regionally, PBR may be the way to go, especially at the state level.
If you want to be measured at the national level, PG is the way to go as ALL showcases are run the same by mostly the same staff who have been doing it for years. Yes, expensive, but if your son is ready to show some noticeable numbers there is probably no better exposure. And yes, all 60's (and 10-yard split) are laser-timed. And yes, you will play live baseball games. So in my opinion, if you want true, normalized measurements across all states (and other countries as well as U.S. Territories), go to PG.
BF is standardized on at the national level as well but in my opinion, nobody really sees the results. You can't dive into the data like you can with PG or PBR. And their arm strength measurement are run-and-guns into a net--not as accurate a measure for an OF throwing to third and home. An OF in a PG or PBR showcase doesn't want to embarrass himself so he actually has to put some arc onto his throw in order to make it look like he has carry and accuracy. No such measure at BF. A catcher throwing to 2nd while at the same time going for a decent pop time and showing accuracy on his throws to the bag is a very different velocity (much lower) compared to the velocity into a net three feet in front of him.