Powerbeats3 Wireless weight ~0.9oz. The description says the Powerbeats Pro are 17% lighter so that would make them about 0.78oz (0.39oz per bud).
AirPods use a double tap gesture on both buds to access customizable controls like Play/Pause, Next/Prev Track, Siri.
Powerbeats Pro have physical volume buttons on both buds for volume and the Beats logo button for a long press gesture to hang up calls.
Both have Hey, Siri voice activation, auto-play/pause when you take out a bud, auto sleep/wake when taking out of the case, auto pairing via iOS 10 and above by opening the case, thanks to the H1 Chip/.