I did both and enjoyed Dingle Loop more...it was just as beautiful. The only thing I took away from ROK is 1. A broken passenger side mirror (didn't realize you could push them in) and 2. braggin' rights, (even though I don't have anyone to brag too.)
Don't push in your mirrors its Illegal, just take a little more time and let the others move over as well. If you have time to fit things in then do but don't force yourself to make time for things you have either read or heard about.
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Two rules for Ireland, Take your time & bring a sense of humour
While driving ROK (in reverse) a tour bus pushed me into a rock wall...I would have chanced breaking the law by pushing the mirror in instead of having it torn off...guess we all just have to weigh our options based on what consequence we desire...
The ROK is certainly not a "must see" if you prefer to see and do other things instead. You must tailor your trip to your needs. Since you have two night sin Dingle you may be pleased enough with the Dingle peninsula and Slea Head Drive.