A little while ago we discussed topiarising bamboos:

Bamboo Topiary

I asked lovely Laura Bebendorf of  Bamboos Wholesale www.bamboos.com which  bamboos she considered most useful for this purpose and she came back to me as follows:
‘definitely the species that are already shorter and bushier
are the most popular and they include the Bambusa guangxiensis, Bambusa
heterostachya ‘Variegated”, Bambusa vulgaris ‘Wamin’ and Bambusa ventricosa’.
There you go. It’s always good to check with the experts about specific plants because, however wide ranging your knowledge is, they can always offer their extra professional advice.