My favorite tank is the Ammit MTL RDA, I have two in daily rotation, along with a ETNA that I also like a lot.
So regarding tanks (never tried a mod), Geekvape is certainly my prefered brand. Very well built and excellent performers.
I'm also very, very impressed with Geekvape's customer support, top notch in my opinion, and that, at least to me, might be just as important as the quality of the product itself.