My son has attended two, one Expo's and the other was the Red's. The Expo's used an Atek pitching machine for BP setup in front of the mound. The Red's scout used the pitchers in the tryout to live pitch to the batters.
The only other difference was that the Expo's had the OF throw from RF to 3B, while the Red's had the OF throw from CF to home. Both had player's pair up for the 60 and had two stop watches. The stop watches began at "first movement" of the runners. Everything else was the same and as described above.