From just looking at the web site. the 200 E is 200 amps , straight forward controls for wire speed and voltage amps (a,b,c,d,e,), 1yr warranty $600. The I mig 200 is only 160 amps, digital read out on voltage and wire speed (fine tune adjustment) 3 yr warranty $800. 200E is a tweeco style gun easy to find consumables, Imig is Binzel style with metric threads for contact tips, not so common but Lincoln 1/4 x28 thread tips do work, same as the CDN tire contact tips for their Lincoln welders. Truthfully I can not tell the difference with the thread pitch checking them on a thread pitch gauge. I myself have the IMig 200 and I went that route just because of the digital read out and 3 yr warranty. Same price as the CDN Tire stuff when it is not on sale but just a few more features. I am not sure if the CT stuff is inverter or transformer style . I always hated to pick a, b, c ,d or e for voltage. I have found dials like that on some machines you wanted a in-between setting or I selected a lower setting made it work. Either one will handle what you are welding. If you think it is to thick for the machine , do a multi pass. Not the nicest welds but they work. My thinking with thick stuff and a smaller welder is when in doubt, max it out on all settings. Same motto for sledding, when in doubt , throttle out. Pin it until you see GOD and then just back off a little.