Why do you believe 20" will be better?
The facts are that the large the rim, the smaller the side wall and with it the ride gets worse, the transition from grip to slip is less predictable and the steering feel is unpredictable with increased tramlining.
Try an M3 with 20" and then try one with stock 18". If you think the 20" still feels better then you are the type of people that 'show' is more important than anything else.
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