I'm reading this thread since it's beginning and wondering how interesting it becomes. So I would like to make a contribution on my own.
As everybody here knows I'm pretty new to vaping (just look at my joining date). Because of that I'm still into the process of discovery of new kits, attys and vaping styles. Actually I think I'm very far of knowing all vaping possibilities. For me, as a hobbyist who never smoked, vaping is all about best possible flavour and greatest possible clouds. That's the way I vape at home and that's what I look for when I try and buy new kits. Only exception is for devices bought to be used in transit or at work. These, for me, need to be pod systems because of its discretion and easy of carry. I always accepted that to be able to vape at work, in the car or with friends and colleagues, I would need to make some compromises on flavour and clouds sides. For me that was always a very natural thinking: perfect kits at home; compromised pods outside. Very well and perfect. But...
Currently I have four RTAs, two sub-ohm tanks, five regulated mods. And I'm completing my second week with my first ever squonk kit, the USV Mach ON3 (review soon!). I have, too, two pods. And I think I have some personal thoughts about this matter, yet. For me, as a flavour crazy guy, there's no question my RTAs are great, but the RDA on my squonk kit is, still, greatest. This Mach ON3 provides me the best flavour I ever tasted, and dense clouds I could only dream with when I had just RTAs. Period. But (yes, another one)...
The difference in flavour between all my RTAs, this new RDA and my pods are by no means so big. No at all! Actually, I find my Breeze 2 better in this regard than my Zeus X (which can be defective, though - I'll contact Geekvape) and only marginally inferior than my Mach ON3, the best of all. Obviously clouds are another very different story, I think there's no possible fight as this RDA is simply insane, but in regard to flavour, yes, my brand new RDA is a par with the Breeze 2 and, even, with my Orion. Than you add to the sum the price difference (30 bucks one, 99 bucks the other), the size and weight difference, the portability... And, yes, I completely can understand who abandoned bigger mods in favour of the pod systems. That's not me, at all. I still prefer so much my bigger kits, using pods only when outside. But when I think about the difference between them now, and consider that pods will continue to evolve continuously for the foreseeable future... Yeah, maybe in future pods will become the definite mainstream, and bigger mods will become something like niche products.
I'll be in that niche, though, together with my pod systems armoury.