Gale force is the better unit by a long shot. The gf has a better motor and switch and a better track record ( at least with us) than the powr flite units . I like the powr flite when I started out because their proximity to the shop, they are literally 6 minutes away from both the office and the shop, but I didn't like the fact that this would go out then that would go out. Even though the parts are cheap and they always have them in stock, we wanted more reliable units.
Also the amp draw on the gale force is going to be a bit higher At 2.5 amps vs the pf f5 at 2.2 amps. But the trade off for the reliability makes it no deals for us.
The only issue we have with the gale force is the well nuts used to secure the protective grills on both side of the air mover. They seem to just come out sometimes for no apparent reason.
I know they it is stated that the pf out moves the air coming out of they go but I would do some side by side testing of your own before committing to a fleet of these for sure.