Nautilus X is Aspire.
Aspire, well... let's just say money is king and being better than the rest doesn't really apply. Same goes for
joyetech. Neither is a total flop but somehow they have created this image of being superior.
joyetech also regrettably make some really duff stuff. If it wasn't for the community goading them into actually trying to make some clearomizers, they'd still be selling atomizer and cartridges.
I use a lot of factory
coils and have dabbled with Kanger, Joyetech, Eleaf, Innokin, Uwell and others. Some are good, some are OK, some are quite bad. None are outstanding, although totally vapeable.
For me, an RDA is the way to go for best experience. Always.