No offense taken, it's just that I'm happy with the results I got with ER70S6. And if you prefer to use RG....I'm fine with that.
I did a lot of reading in the course of getting ready to weld the Eagle fuse, and it seems the ER fillers are rapidly gaining acceptance in oxy-gas welding. No doubt this is reflected in the move to ER filler by the highly regarded Tinman guys. RG has a lot of field history and is still the go-to filler for a lot of welders, but it is no longer the only option.
Of course, nearly everyone will be using TIG in years to come so this will all be moot.