@tcs1366,
Not sure what you mean by Sun Hosta is basically "albomarginata". I grow several Sun Hosta and I grow Hosta 'Undulata Albomarginata' in several different places and they are not basically the same. I also grow 'So Sweet' and it appears to be almost identical to Sun Hosta. Here in zone 8b they hold up pretty well in the sun, but they do better with some shade.
I would not say they thrive in direct sun even here, maybe they would further north.
