We go to Goldstar more, but mostly because their locations seem to be more convenient. I like Skylines too. Skylines chili sauce is little more cinnamony but that's about it really.
Going to a Skyline restaurant is more of the Cincinnati chili experience whereas Goldstar of more fast food-ish.
Skylines table hot sauce is lot hotter that Goldstar's so I have to remember that. More than once, I've doused my 3-way with really hot sauce (I love hot sauce) and paid for it
I've got my kids trained now to eat the oyster crackers before the chili comes with a little dot of hot sauce on top of each.