I don't know sir if this would still help, apologies for replying late. For 3605 and 3005 it would depend on what you want to have with your machine. 3605 would have a plastic body but it has a pressure gauge and a shot time. For 3005 naman sir stainless steel yung body nya but no pressure gauge and shot time, so depende po if you want to go with a plastic bodied machine with variables that you can use like shot time and pressure gauge, or if you would prefer a stainless steel body machine without those additional specs 😊