Differnce between 57 and 58

[sawyerrm]

Decided to broaden my search from tri-fives to all TF trucks. Aside from the front end and option of fleetside, is there any significant differnce? I'm asking from a buyer/driver perspective so things like parts availability and resale are important rather than appearance. My wife actually likes the four headlights, but then she thinks I'm handsome so there's no accounting for taste.

Apologies, this question has probably been asked many times. I did google before asking you experts.

thanks,
Rob