There are other kiwi posts. I have not seen any devoted to best tasting. It kind of important when selecting a cultivar to know what others think. In grocery stores I have seen 2 types, one was fatter and more squared, and I thought sweeter. Most people sell Isaai. But there are listed red varieties and others.
My region is zone 8b, so I would like to discuss what works here. But I want all regions to be able to discuss here, not just for me.
I’ve only tasted Anna so can’t help on best taste but here are some cultivars :
Chang Bai Giant
Natasha ™ Russian
There are also yellows and named males.
List of yellows here: