When it comes to flavor, all things being equal (mostly power), I'd say that chamber size and coil length are the most important. But that's my opinion. And my opinion is beside the point. My point is that your opinion is all that matters.
My girlfriend's IGO-S (on a Twist, single coil 32 gauge 1.5 ohms 4.0 volts) gets a much more subtle and satisfying flavor profile than my IGO-W (ELA, dual coil 32 guage 1.0 ohms 13 watts). For her, flavor level is perfection and the vapor levels are ideal. For me, my setup gets a more intense flavor, more throat hit, more vapor, and epic levels of gut-level satisfaction. But that's an opinion she and I reached through much research and experimentation.
As my girlfriend was seeking that vape-shop-flavor-bar subtlety and has found it with the IGO-S, I'd say that your order was the right choice. I'll be the first to admit that a well set up IGO-S will be able to make more flavors taste as they should (i.e. good

) than a dual coil IGO-W. Perhaps because of the tiny little chamber concentrating all of the flavors. But I wasn't looking for subtlety. I was looking for power enough to transform me into a dragon.
[As a disclaimer, I have experimented more with drippers than tanks, although I've owned a Terminator-C and Ithaka. I can't help with this dilemma.]
What I know for a fact, though, is that my Super-T ELA is the best mod I've ever used. I'm convinced that I will use it until I lose it.
I hope this helps.
Funny you mention the igo-s, because i have one coming. I did not know that you could get different caps for them though. Also I am not sure that is the setup I want but it was cheap. I am still very new to vaping, and equipment. I have been doing a lot of research and it is straining my brain; there are so many options.
I do not know what the difference in vaping is from a dripper? (igo-s/igo-w style) compared to something like a carto tank setup or doc dave, etc
I currently use an igo-w on my magneto but I am not too sure how much I really like it. I know the igo-s will be a similar experience; then maybe I have something setup wrong. when I use the tank style setups at the shop to test flavors, they give me a better vaping experience than what I am getting from my current setup.
I'm actually looking for something small for the 14500 and reg size and my list keeps growing for research.