Agree with Caddyman. White, even if they use clearcoat (e.g., Mercedes, BMW) lasts the longest. I live in Sacramento where the 110F summer days and blazing sunshine are rough on paint.
1981 Toyota, white, owned 17 years, looked like new when sold
1991 Volvo wagon, White, owned 19 years, looked like new when sold
1997 BMW, White, looks perfect
Worst colors - metalics with clearcoat - dark red, dark grey, or black.