Still on an old Intel Air but looking for an M-class does not have to be the latest. 1) How does the M1 Pro compare to the M3 base? Chip performance only. 2)

Still on an old Intel Air but looking for an M-class does not have to be the latest. 1) How does the M1 Pro compare to the M3 base? Chip performance only. 2) M1 Pro's seem scarce. People holding on to them?