Well, if you will be putting 240 volts in your shop in the future I would probably recommend the 211. If you want to stick with 120 volts then go with the millermatic 140. They both have the same output power on 120 volts. They are both 90A @ 20% duty cycle. They are both spoolgun compatible, the difference is the 211 has the dual voltage input for both 115v and 230v and costs about $400 more.
Owner/Operator of JNT Mobile Welding & Repair LLC
Millermatic 350P Aluma Pro
Maxstar 150 STL
Hypertherm Powermax 45 and 85