Yorgos, to answer your question, yes NZL is superior. It is better tasting out of hand than the Sanbokan as well. I grow both, but had to cut down my large citrus tree with the NZL, ponkan, sumo, and 20 other varieties on it. Even some super rare varieties.
I just bought many of the varieties I cut down from UCR again, should be getting my budwood this week. NZL is one of them, plus all the new Australian Fingerlime varieties they are selling now for the first time.