As a subtank owner, even though it has an available above ohm coil, it vapes like crap on the smallest airhole at similar watts to a nautilus (I own and use both).
As far as I'm concerned they serve 2 different purposes and vaping styles. The nautilus is great for lower watts and restrictive air flow, for mouth to lung vapers. The subtank is great for lung hits and all the vapor and flavor that comes with that style vaping. Neither is better than the other IMO.
With that said, the subtank can be used with the smaller airhole for mouth to lung, but not with any of the prebuilt coils. You'll need to use the RBA section to make your own. I've built coils that I use in my Kayfun and it works fantastic.