Smok is notorious for poor quality control; Vaporesso has a pretty decent rep so I'd go with the Tarot Nano
Odd, like I have said before, Myself, and some friends have always used Smok, not a single issue.
I suggest get what ever you decide on from your local vape shop. Internet can lead to knock offs. Take a look at some you tube videos, see what mods offer you the things you really want in a mod. Learn to take care of it, NEVER charge any mod usb. Get a split charger.
IMHO, Find the one that best suits what you want, take care of it, and pretty much any mod out there should last you along time. Keep a back up if you can, and sadly, no matter what mod you go with, they sometimes do go bad, and tanks leak. Happens. Nature of the Beast.
Myself, the single battery, with the fire bar, Smok AL85 has been rock solid, but you may find other mods people list here with the features you want, and better fit your needs. Youtube it, Google it, find the one that best fits your budget, and pull the trigger.
And lastly, remember, any mod can be fragile, its a tiny computer. So take care of it. Best of luck, and let us know what you went with!! On a side note, go to your local vape shop, handle the mod, make sure it feels comfortable, I HATE the big bulky mods, others love them. A mod, its such a personal choice imho.