[ArtemusMaximus]

Here is Updated Comparison Table. Thrown CFM graph for better visuals.
Also added table with just Viair 90C & Thomas 215ADC38/12. Sort of to compare compressors that very close in weight and size category.
Judging from the spec sheets, it seems to me that the only reason to chose 215 over 90C is for slightly better endurance and better initial CFM performance up to 20 PSI.
I am pleased that Viair 250C-IG is legal and I think it's worth looking elsewhere on the bot to win those extra 4lbs that this compressor adds