I've been in a friend's 4C, and the two cars are really rather different!
I hope this doesn't sound like skewed advice, but if it's for a 'first and only' car, then the Alfa makes (a lot) more sense.
If it's a 'second' car, the Alfa probably makes (a little) more sense, although you do seem to be of the perfect mad and bonkers and like it 'raw and direct' school of motoring that makes you very well prepared for M3W ownership.
If it's a third or subsequent car, the Morgan makes more sense!