I've seen and eaten something that was a lot like a french fry and an onion ring mated and made something that looked like a twirly mess of fried potatoes and onion
In french Fries you get a crunchy, soft side that goes well with pretty much anything.
With onion rings you get a nice fried crunchy side with the sweet taste of a cooked onion that goes well with any salty-sweet combination. my personal preference: Fries
Depends on what kind of onion rings you're talking about. If they're the deep fried ones, I don't like 'em. If they're the fun-yuns or whatever they're called, I like 'em. I prefer french fries, though. They taste better to me.