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Er70s2 and er70s-6 are the go to industry standard rods for joining chromoly. A good bet and cost effective. Well understood metallurgy in that combination
Many framebuilders use stainless filler. Er312 for chromoly, some use a proprietary filler called weld mold 880t which is very similar. Stainless filler flows differently and can be nice to weld with but really should be purged as best practice. Certainly in my opinion on thin wall tubing. I use a mix of the two depending on how I feel/the joint and materials used.
For joining chromoly to stainless (usually dropout joint) use 309
Biggles567
What filler rod do people use for 4130? Miller recommends ER70S-2. It is mad expensive though