I have two Mercedes-Benz's, a 1980 Mercedes 450SLC and a 1976 Mercedes 280s and I can only fix one.?

I love Mercedes and I know the 1980 Merc is a V8 and is one of the most beautiful Mercs ever, and the 1976 Merc is a straight-6 and is one of the most luxuries Mercs ever. I can only fix one and I can't decide but i really need to know.