I like the Aero better for several reasons:.
1). The Nautilus Mini only has the 4 air holes, which ime is actually only 3 because I can't get any air through the smallest one. The Aero has a slider which gives much more control over air..
2). I have to use a small wrench to get the Nautilus apart for refilling and cleaning. I've had it for over a month and it's still a pain to get apart..I ended up bending the threads on it because it was so darn tight so it still works but it doesn't sit flush anymore. Not a big deal but still a pain to refill.
3). To me, it seems like the Nautilus holds juice flavor from a switch over. It takes me much more cleaning and rinsing time to change juices and not still get the old flavor, even with a new coil..
4). The glass on the Nautilus is thinner and seems easier to crack or damage (I haven't yet so that may just be my assumption based on the glass thickness). The aero comes with the backup stainless tank and the Nautilus doesn't come with any backup tank..
5). The Kanger coils are cheaper (may not be that way for long). I have been dry burning both type coils and the Nautilus coils are better imo so this may be a moot point..
With that all said, I received a Nautilus, the larger size, 5ml in the mail yesterday and I like it so much more than the mini. All four airholes work great, didn't need to raid my husband's tool box to get it open, hits great, etc. I would definitely recommend the larger tank if you're set on a Nautilus. 101Vapes still has that sale going for $21.99 and it comes with 4 coils (they usually only come with 2).
I think you'd be happy with either tank, but I would definitely go for the full size over the mini, just my

after trying both.
~Cam