best kind of teacup for green tea?

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thank you
i understood that for green tea usually is better glazed, but why is it suggested very much unglazed kyusu for green tea?

Many tea drinkers feel the unglazed clays from Tokoname, Banko, Bizen, & Shigaraki have a beneficial effect on the tea. My experience confirms this and all have high iron contents.
In the case of Hagi, which is a glazed production but very porous, the clay can also effect the tea. But, it is recommended when using unglazed teapots to try and stick with one type of tea in each because of the residue that the tea leaves behind. With a hard glazed teapot, this is not an issue, you can use many different kinds of teas in it.

so, is ok if i use it only for green teas (chinese and japanese) or you mean for one type of tea? (for example only use for gyokuro or only for sencha or only for lung ching ornly for one type of tea)

Better for 1 type of tea but I often break that rule.