M6 is lighter, handles better and faster then M5 but it's also only two doors.
The m5 is faster than the m6gc
If you need a 4 door the m5 is the way to go unless you will consistently have grownups in the back. M5s rear leg room is a bit of a jake for a full sized adult.
The i3 I yet drove had more legroom.
All and all the m5 was and is the correct choice for my needs.
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