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Alfa Romeo 4C-Spider vs Porsche 718 Cayman: 5-year value retention (95% vs 90%), resale value, and cost of ownership head-to-head. Alfa Romeo 4C-Spider holds its value better.
On five-year value retention the Alfa Romeo 4C-Spider comes out ahead, holding about 95% of its value versus 90% for the Porsche 718 Cayman. Over the first five years the Alfa Romeo 4C-Spider loses roughly $3,291 while the Porsche 718 Cayman loses about $7,540 — a gap near $4,249.
First-year drop is the biggest factor: the Alfa Romeo 4C-Spider sheds about 1% in year one versus 0% for the Porsche 718 Cayman. If you buy used, the steeper early drop is what the original owner absorbs.