The eternity band is by far the ring model I wear the most! Few ring styles are as versatile as the eternity band. It is absolutely beautiful worn alone as a single piece, while at the same time being the optimal stacking ring.
The classic eternity band is the full covered band, with gemstones set all the way around. I myself usually prefer this, as I don't have to think about whether the ring has twisted during the day and the stones are facing downwards.