I would say that the GT2, GS and Flash-e and my Phenoms are equal in taste. As far as easiest atty, the Flash-e beats them. So easy to see if your coil is clean, Great air ( I use it without the screw ) easy to fill without taking apart. ITs not the purdiest, but it has a certain industrial elegance.
The GT2 took me about 4 rewicks to get it perfect. I find no tails out of the chamber, wicks rolled inside with high shoulders and mesh straws resting snug, but not tight on the shoulders is perfect. I leave about .75 mm hole inside the mesh straws for my almost all vg juice.
It holds actually 5mls and the short or chopped tank setup is more compact but still holds 4mls.
Phenom is the most aesthetically pleasing but it has its little quirks, but its not hard nor does it take long to get used to it and taste is great.
TGT2 is a pleasure to use, looks great, but the dialing in of the juice control takes a few times to get the right amount of space to let in enough liquid and not too much. If it had an adjustable JC that could be done on the fly and not open, it would be the perfect large tank. It also does not actually hold 5mls like it says, more like 4ish.
Those are my opinions and Im weird. Flavour is most important and all 4 of these are wonderful in taste. Flash-e is the most airy, but taste is still just as good
Thanks for your initial review