I am not guessing 235/60's work better, I know they do from back-to-back experience with both sizes. The 215/65's are the SUV designation and ride really rough. They are terrible on expansion joint thumps. They are so skinny (even though they are called 215/65) that the lip of the wheel extends past the tire side wall. You will for sure curb your wheels.
I remember when I bought the 215's I had real buyer's remorse because I thought the Scorpions were better. The 235's are superior. There is no disadvantage.
That's how I see it.
'04 XC70, Ice White, Taupe. Original owner (196K miles as of may21). 6 wheel bearings, broken ignition switch, broken turbo downtube flange, failed throttle body, many warped rotors, and a myriad of weird crap. Still my favorite car ever.
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