I am not sure this helps but I have owned a C63S wagon and driven the G80 several times and the ride comfort is substantially better in the G80.
The chassis setting is much more compliant, especially in the comfort setting, and there is also much less road noise in the BMW.
Assuming the C63S convertible is similar to the C63S sedan and wagon in terms of ride comfort and the M4 Convertible is similar to the M3 the BMW is the more comfortable car.
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