I was actually stuck between the M6 GC and R8 for my next car choice, decided to trade my 650 in for a 2018 M6 GC with 13K KM
(picking it up next week)
R8 is fun as heck but definitely not as practical haha, if M6 is your only car, I'd say you're in a fine place! but if your heart screams for the R8, cant go wrong, just forget about practicality