I really, really like Kangertech tanks. I started out with the Evods. I upgraded to the Evod Glass and the Mini Protank 2 and recently bought a Mini Protank 3. I like their mini tank's reliability and how easy they are to maintain. I also like the smaller size because I like to change flavors fairly often. I've seen people talking really highly of the Aspire Nautilus. I've also seen people talking highly of the Aerotank. Since they both make mini tanks, which one is more reliable and easy to maintain?
I think the short answer is the mini aerotank is the "easy" tank.
(Note: I do not have a nautilus; I do have miniprotanks and mini aerotanks.)
The nautilus tanks use threaded glass (the top is threaded, not the bottom).
The aerotanks, like the protanks use a straightforward glass tube.
The Aspire tanks have interesting design differences which attempt to be an improvement compared to the Kanger 'plain jane' kind of design.
The Aspire heads for example, puts the air intake on the sides of the center pin, which is an improvement I think of the plainjane design of the kanger heads which just uses a hole vertically though the center pin.
In terms of what's easier to figure out, simplicity of design, it would be the miniaerotank.
Another big difference between the two is the miniaerotank uses eGo thread, whereas the mininautilus uses 510 thread.
If the reason you're comparing the 2 minis is because you want to use them of eGo batteries, then the aeromini will match flush because of the eGo thread.
The mininautilus will benefit from a beauty ring if used on an eGo/510 battery.