Any recommendations which might be best? Also which one is easier to drive
We love the Beara peninsula, and in fact make a beeline for it on our own trips, but that's because we've already seen the attractions along the ROK several times. The Ring of Kerry is famous for good reason - it's spectacular, especially if you go off the beaten tourist track and explore a little further afield along the splendid Skellig Ring Road and out to Valencia Island.
Beara is more remote, with much less car traffic than the ROK. It too features some spectacular seascapes but lacks some of the attractions that make Kerry so popular ... like the Gap of Dunloe for example.
If it comes down to an either/or proposition for you then the ROK is probably the better choice for a first time visitor.