Depending on how much your doing thouh and if your mobile or not plasma is the way to go. If your a yard cutting up number one steel or big stainless, getting set up with a 125 amp hypertherm unit would be the way to go. Expensive to buy unit and air compressor and run 3 phase but once set up build an enclosure so machine is out of elements and locked up at the end of the day, and all you gotta do is flick a switch and go. Only gotta change out tips. No bottles to worry about and plasma cuts way quicker