A buddy of mine with a welding truck (Ranger 305G) uses the Air Liquide for more critical work but mostly uses the OK 55. He says it needs about 10% more amps but welds pretty nice. The 5/32" comes in 18" lengths instead of the more common 14".
A couple places that do metal roofing specify Air Liquide Ultra 11 6011. They say the 6022 rod made for burn through metal roof welding is garbage and the AL 6011 will do a lot more welds (inches) than other brands of 6011. They tried 6010 but didn't like it all for their application.