I agree, Dark Link, Adult Link from OoT, and Retro Link are cool. Also, Retro Link from the NES era had brown hair not red hair.Dark Link,
I like when Link is an adult as it feels more like me...being an adult.
I do like some of the art work from the NES era when Link was red haired and before he got all "Anime" looking....but that might partly be nostalgia.
Link is my favorite hero, mostly because I can relate with his appearance.