I would say too general to just compare one color against another. Different varieties of beans seem to be more tender and taste better than others. But then what tastes best to one person doesn't necessarily mean that another person will agree.
For years and years and years all I grew was pole Blue Lake. But once I decided to branch out and try new to me varieties, I found beans I like better than the Blue Lake. Not that there is anything wrong with that variety. If it was the only thing I was growing, I would gladly eat them. But when I had some of the other varieties last year, I preferred to eat those beans if I had enough to cook up.
I had read about French Fillet beans which were supposedly more tender. I found that to be true and they were excellent in taste and texture.
