Would a set of raptor wheels and 285/76/17 look better then the setup I have now? And how much better would ride quality be with 17in wheels?

 

Absolutely, The ride would be better with the 17's but you should stay away from "E" load range tires.
Better off road ability is another bonus going to a smaller rim diameter.

 

I was going to go with c rated tires Toyo open country at3

 

Function matters, not looks. Unless you’re a teenage girl.

 

I have 285/70/17 Nittos. I think 285/75/17 would be perfect as I wish mine were a little larger. I never had 20s so cant talk to ride comparison but these ride pretty plush.

 

I have the same rims you do and the same tires. Not sure the size you are running but I prefer the rims and tires we have versus the raptor wheels. I cant exactly say why but the raptor wheels have just never done it for me. To each their own I suppose though.

 

Good choice, anything other than "E" rated tires around that size are hard to find.

 

I kept my original rims