I own a 300D and have welded with a 200D a number of times. I do mostly pipeline welding and I love the way my 300D welds. I dont notice enough difference in the arc between the 300D and 200D to Justify giving up AC power and paying more for the 200. Im not saying the 200 is a bad welder because its not, its a great welder but for me I prefer the 300. I would suggest welding with both and buy what works best for you.