I think everyone's giving you about the same info - which should start with: "you've got a GREAT list there, for MTL vaping!!".
I've got all three. Here's my thoughts on each in case any of it matters to you:
1 - Cyclone AFC. I use this ALL the time, but I use it WIDE OPEN, and do a lung hit. Back when I started with rebuildables, I liked a TIGHT draw - and liked the Cyclone with the stock cap - TINY little airhole, but leak-proof. The AFC, it's kinda easy to squonk out the airholes...but I'm getting just the hit I happen to like (weird me - single coil, but both airholes open).
2 - Atomic. Might be the most flexible, because it's set up better than the Cyclone for dual coils, and has an AFC, too. But if you're STAYING MTL and single coil, I'm not sure if it's got any advantage over the Cyclone. My opinion here is stilted cuz I keep building my Cyclone single, but keep building my Atomic dual..
3 - Reactor. No AFC. BUT - if you can dial in what airhole size gives you the draw you like, then this atty has a couple advantages. Like no AFC to allow leaking or to change setting on you. And if your airhole's kind of small, it might be completely leak-proof. Also, this thing is built like a solid ingot of steel. Put a Reactor on a Reo, you can pretty much hammer nails with it.
You'll probably end up like the rest of us - with an atty collection.
Pick any one of these, and you're off to a good start!