Booster plug only works under a change of throttle and not a steady throttle.
A Power Commander 3 requires disconnection of the lambda probes, a hilltop remap does not. The newer PC5 can self-teach with the relevant lambda probes purchased from PC but the setup is very expensive, making the hilltop remap cheaper than PC5 with PC wide band lambda probes. The earlier PC3 states 'for offroad use'.
Also, a remap is basically invisible to an insurance assessor, a power commander is obvious in the event of a claim assuming you haven't declared the modification. Failing to declare a modification will invalidate your insurance policy, and a declaration is liable to increase your premium in the current insurance market. Caveat emptor.
I have a PC3 and sports headers sat in my garage, haven't fitted them yet, I will most likely wait until renewal time then get some quotes with/without.