What advice about tires and rims on 2008 Ford F-150

I have a black 08lariat. There r 18''s on it now. But I was looking into maybe buying new stock take offs from a 13 fx4 which would be 20's. I have been having a hard time tryin to find out where to maybe get a look at what would look good. Wether they be the all black, charcoal, or alloys that come from this year. And would there be a big difference in the ride goin from the beefierr bf goodrich to this type of tire and rim? Not sure if bein on this site is way off base considering it wouldn't be a repair but any assistance or a point in the right direction would be helpful.

Asked by for the 2008 Ford F-150
we do a lot of tire swaps here at dealership. may have a bit harsher ride as sidewall will be shorter. also will have to have pcm recalibrated for larger wheels to correct speedometer.