The ER70S-7 I used was .035, and the EZ grind was .023. I find that .023 wire is more prone to tensioner and birdcage issues, which is another factor that dictated the heat setting. In planishing, the EZ grind appeared to be slightly harder than my experience with planishing the -7 on the fender shave. The EZ Grind also appears to have more slag issue than the -7. If I had my choice, it would be the -7, but the EZ Grind is still going to likely be better than using the -6 and it's harder welds.