RTA's are pretty nice but nothing will beat the flavor of a rda.
Maybe it's just the juices that I have tried, or the tanks vs drippers I have tried, but I really don't notice much difference between them even less after 1 or 2 hits. Now I will say that to make the comparisons more accurate I used the exact same coils in both.
First round years ago was Smok ARO's VS Igo-L both with rebuilt 1/16" Kanthal A1 micro coils. I couldn't even tell a difference in flavor.
More recently I have tried Smok TF-RTA and Serpent SMM vs Hadaly and Entheon clones, ALL with 3mm 26ga SS316L coils in TC mode with the same settings. The 2 drippers are SLIGHTLY better for the first 1 or 2 hits after a fresh drip than the SMM, but after that they are just wicking from the well below which is what a tank does all the time. So the flavor and vapor were practically identical between these 3. I will say that in all cases the 2 drippers and the SMM were a slight bit better than the TF-RTA but I think this may have to do with the fact it is bottom AF while the other 3 are side AF. Even then the difference wasn't huge.
My overall conclusion are that AF, coil, and wicks are MORE important and make a bigger difference than if it's a dripper or not, and that with the same coil and AF there is little to no difference beyond 1 or 2 puffs per drip. To me the advantages of not having to constantly drip far outweigh the taste difference for 2 puffs every so often. I do use my drippers and I like them, but I don't see them as some holy grail of flavor. I will say that ALL of the tanks and drippers I have tested are single coil. It is possible that there is more difference between dual tanks and dual drippers. I should also point out that in ALL cases I was using simple round wire coils. It may be possible that using exotic fused alien framed staple ultra mega coils will showcase flavors differently between tanks and drippers. I will also add that my "methods" are not necessarily "scientific" and my experience may or may not be your own. This is just what I have tried and what my opinions of the results were.