hmm lets see.. I have a KFL+v2, Flash-E v3,
Taifun w/ Immo Ceramic, Rose v2 Stumpy, and Orchid v2. All authentic besides the Orchid. If I could choose only 1, it would be the Rose v2.
KFL is tried and true. Taifun is great, but can be finicky to wick right. Flash-E has an exceptionally smooth draw, but it's ugly and can have problems keeping up with wicking on lower ohm builds. Orchid gives you loads of vapor/flavor, but eats through
juice faster than you can refill it, and doesn't give you access to
coils.
Not an easy choice, but the Rose has every feature you want. AFC and
juice control mean it can handle any build you throw at it. The ceramic cup and tiny tiny chamber equate to the best flavor out of all of the above atties. Also, it is easy to fill and you can work on your coils without dumping. Last but not least, it looks great and has very compact form factor with the stumpy kit.
Hope this helped!