I've only eaten them as green beans but they're apparently also good dried, here's a link https://agardenerstable.com/2013/01/30/a-bean-worth-drying-the-scarlet-runner/ . I want to try that this year.

I've grown Scarlet Empress and several different varieties and colors from Territorial Seeds. I thought they aii tasted nice but can't remember if any were tastier than others.