I just switched from 23mm pro 4 tires to 25mm power endurance. The tread obviously wears longer, based on how long it took just to wear the mold parting line off the front tire. There is no reason for the puncture resistance to be worse. The frequency of flats is merely by chance. I've ridden about 3500 miles on the pro 4 tires without a flat, but all it takes is one broken bottle on the road to end that lucky streak.
Be sure that you have clearance for the 28mm size. Not all bikes do.