Instead of just listing off a bunch of shit I like, I'm going to make categories.
* Means I REALLY like it, ** means best in class, *** means best in list.
Flavor RDAs:
Nixon V2 *
Fishbone
Petri V2 *
Derringer
Marquis *
Wotofo Ice Cubed
Sapor *
Kennedy (Not the Competition version)
Hobo V3
Magma Reborn **
Minicat *
Veritas
Druid
Lepton Micro
KSD Nipple *
Freakshow / FS Mini
Mad Hatter / MH Mini *
Alien V2
Plume Veil V2
Royal Hunter Mini
Airforce One V2
22 or 24mm Tugboat
Aeolos V2 / Mini
Torque
Aeronaut
Zorro *
Cloud RDAs:
Competition style Kennedy
Mutation V5
Mutation 234 *
Doge V3
Ghost V2 (The one you can hardly ever find, not the one with the Pacman Ghost on it)
Alliance
Mason 24mm *
Tsunami *
Double Vision
Mephisto V2
Tactical Warhead
Payload *
Velocity / Velocity Mini *
Royal Hunter
Hellboy
Dark Horse
Hannya RDA
Buddha Mini **
X1
Lush *
Cloud Champ V2
Troll / Swirlfish
Bullet
Hollow Point *
Subzero
Baal V2
Crazy Coil Build RDAs:
Indestructible
Twisted Messes Squared *
Goon **
Rafale X *
Anzu
HUGE RDAs:
Full size Buddha
Temple **
Mutation XL series
Mason 30 or 40mm *
Alliance Fat Boy
Kool 30mm *
Novelty RDAs:
Chess **
Turbo V3
Any UD/Youde IGO
Wulf *
Low Pro
Then there's RDA's like the REM that are good for Squonk boxes, or Reo style ones like the Marks Bug Chalice, Reomizer, Cyclone, Bauway BF, etc.
It all depends on what you want, your style, etc. Check these out, use them as reference, there's hundreds. I listed the best in class I know of, you be the judge of what works for YOU.
OR if you like tanks:
25/30mm VCMT
Griffin 22/25mm *
Boreas (best ever anything) 25mm ***
Aromamizer Supreme *
Aromamizer V2
Sigelei Moonshot *
Hannya RTA
Wotofo Serpent / Mini
Merlin
Kaos Erbus
Gemini 22/Mega
Herakles RTA-2/RTA-4 **
Avocado 22/24mm
And SO many more.