I don't have a Crown, but I will put my hat in for the TFV4, loving it. The RBA decks are so easy to use. As someone who was toying with rebuilding Atlantis coils god, RBA's are great, and that gigantic deck is just beautiful and easy. I initially had some problems as I was trying to prevent the leaking issues I had read about and packed the cotton a bit too tight, meaning burnt cotton... yuck. But, after a couple tries and reading/watching some videos I've gotten it figured out. From what I'm reading crown has a smaller RBA deck, and smaller = tougher, or at least if you don't have nimble little fingers, which I don't (yay shaky giant hands). Top fill is great. No matter what tank I've used when I take it off to refill I'll end up with some juice on my fingers, not a huge deal but a bit annoying, not so with the top fill I can just keep it topped off and all's good till I need to replace the wick/change the coil.
Anyways, I'd give a 10/10 but I feel that's kinda silly to do not having had a wide range of alternatives, but lets just say I'm very happy with everything about it. Got some max VG in the Dual RBA right now and I'm going to go back to vaping my desert.