I can help you here, as I have an r200 and about 15 different attys. Here's the list of what I have:
R200x, iStick 100w, Hells Gate 200w and a siglei 75 watt.. the R200 is my primary. The attys:
25mm Kennedy Clone
24mm Avocado Authentic
24mm Tesla Authentic
22mm Velocity Authentic
22mm Hatty Authentic
22mm Darkhorse Authentic
22mm Mutilator v4
22mm Mutilator X v5
22mm Petri
22mm Freakshow
Wotofo Ice Cube
Three different Rubik's Cube style clones.
Now, the experience: The Mutilators provide heavy vape and decent flavor, but
juice will get through the side holes if you over-drip. Freakshow likes to overflow into the lower airholes, spilling out onto the deck, petri clone was defective, 510 tip does not fit snugly, hole is too big... will have to modify that.. The velocity works well, is easy to build on, and has nearly limitless airflow adjustments and is a good standard vape atty. The ice cube is also nice, and has a screen on the chuff tip to knock down the spit back which is nice. The Hatty has a good
juice well and tall posts and is also easy to build on and doesn't seem to leak even if you WAY overfill it.. plus the window lets you see how you're doing on juice. In all, they all work just fine if you don't mind managing drips. For the most reliable and maintenance free top I've used so far, I've got to give it to the Tesla RDA and the Kennedy 25 clone. The kennedy has tall hole posts so you can hold more juice. The Tesla has a glass and a metal sleeve, I'm using the glass and it comes with a pair of really nice claptons for the stuff that comes with these devices.. I went with some tiger coils instead and like those better. My recommendation, Tesla and Kennedy25 -