In which cases(applications) carbon nanotubes are better than graphene ?

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Sanhita Ray

Depends on the particular application you want it for.. If you want strength CNTs are stronger. For a 2D electron cloud on device surface, graphene is the best option.

Hassan Alshamsi

Carbon nanotubes are better than graphene for mechanical reinforcement(carbon nanotubes-polymer composites) or flexible and stretchable electronics.

Mark J. Hagmann

I have used single CNT as field emitters for a source of electrons, and as single conductor transmission lines at high frequencies. You may consider graphene as an "unrolled CNT" so the different applications that I described require the different shape of the CNT.