I do see one rather significant advantage to Presto pressure cookers & canners:  I can get replacement seals and other consumables right here at the local hardware out in the middle of nowhere.  A few years ago, my g/f managed to lose the little overpressure safety seal and thought for sure that it wasn't replaceable.  I was back in less than 30 minutes.
The timers on the electric cookers would definitely seem to be an advantage.  OTOH..... not sure I'd want to leave a pressure cooker unattended.  But that's me.