Choice between Savannah GA and Charlston NC
 

If I had to choose between Savannah GA for 3 days and Charlson NC for 3 days - which is more fun/eccentric/unusual?

Charleston SC has more to do and is more walkable. Savannah due to the thousands of arts students studying at SCAD is more eccentric.

I don't know why you'd have to choose. They are 100 miles apart and both worth visiting.

For "fun/eccentric/unusual" I'd pick Savannah.

I think I would pick Savannah, given your criteria.