I've found the tastiest and best juice flow coils to be Vaporesso cCells (like primarily for Target tanks but can be used for many other tanks that take Triton/ Atlantis coils too).
I go 'mid ohm' with 0.9ers which give fairly good, respectable enough, long lung hits for me with full flavor without using up eliquid too fast.
It's amazing the difference in flavor you get depending which tank you put them in. Which is obviously not a fault of the coils, but it really helps to separate the good tanks from the bad.
Good tanks for flavor: Sense Herakles (bottom fill), Triton 1 (do not overtighten or it leaks out overnight), Amigo Riptide (bottom fill, an underrated gem). These all take Triton and Vaporesso Target coils but AVOID Atlantis coils like the plague! My Uwell Crown was good but I must have got a bad batch of coils recently and my trusty old Nautilus Mini always tastes good as well.
Bad or inadequate tasting tanks are probably worth mentioning too, I think. Here's some I have found: Aspire Atlantis 2 (it just seems to leach away the flavor from any liquid or coil, really weird and total shit, no one here recommending it, I don't think), Triton 2 (how could such a beautifully engineered tank taste so insipid and flat? It must have inherited something from the Atlantis 2. Much worse tasting than the Triton 1), Joyetech Cubis (AVOID!).
Good coils: Vaporesso cCell 0.9 and 0.5, Aspire Triton 1.8 and 0.4 (I think it was), Uwell Crown was good and I have a new 1.2 box to open so fingers crossed, Amigo Riptide/ Donner 0.5 (these virtually unknown gems have a genius little innovation involving nickel mesh at the juice entry holes which wick juice really efficiently into the cotton and coil, practically eliminating dry hits or the need to huff and puff to reprime after its been sitting unused for a long time. Love the one that came with the Riptide, so I reordered a new box of 5. They'll fit all tanks that take Tritons and cCells too).
Shit coils: Atlantis, Morpheus, Cubis.
Just some of my own personal experience.
Helpful list of tanks are interchangeable with Triton/ Atlantis style coils here:
http://vapingunderground.com/threads/aspire-atlantis-coil-fits.110143/