I own both a Nautilus Mini and a Subtank Mini. Both tanks deliver good flavor, but if you like a cooler vape or are not a lung hitter, I think the Nautilus is a better fit. I've also had more problems with the Kanger, such as spitting with the 1.2 ohm coil, occassional leaks, and trying to find a comfortable sweet spot (as the Kanger tends to run hot). My two Nautilus Minis have pretty much worked fine from day one. I haven't used the RDA section yet, but I may try that with a 1.8 ohm single coil and see if that finally gets the Kanger where I want it.
Also, if you go sub-ohm, you'll likely need new e-juices at a lower nicotine level.