i beleave the elocker is more expensive(purchase price)on its own but once u get the airlocker then also the compressor it then works out more.not sure about install cost but its not just the locker its the compressor also for the air locker so id be thinking it would cost more then just a switch

id go the elocker over air, i can fix electrical but id be screwd if i riped a air line somehow i doubt if ductape/ zipties can fix that