I have them both; but while I have one 92FS, I own four High Powers. They are both fine firearms. I would give the edge in reliability and bullet digestion to the Beretta, while the High Powers take the gold in accuracy. Hi-caps for both are plentiful and inexpensive.
The High Power feels better than the "holding-onto-a-brick" Beretta, but needs some tweaking of the sights, trigger and safety before it's up to the ergonomic level of the Beretta.
The Berettas have had troubles in the past with breaking their locking blocks, and there was an issue with the slide developing cracks. I believe the slide problem has been addressed to most everyone's satisfaction.
I wouldn't feed either gun a steady diet of any +P ammo. If you need a round that hot, just buy a .357 SIG and get it over with.