Lol i was doing those for pay too for my dads and uncles company. My job title is shop b**ch as my uncle would say. And I know i just love 7018. I really dont ever use anything different. And 7018 ac is just for if you got an ac welder and you like how 7018s weld. Use the ac ones when you got an ac machine cause they just run way smoother than the regular 7018s used on ac. Regular ones dont run as good and has more spatter, they still work but dont get near the performance.