I have several Kayfuns (3.1ES, Lite+, and V2), Fogger, and Squape Reloaded.
By far my favorite is the Squape Reloaded. In fact it's the only RTA I use anymore, and I'm thinking of buying a couple more. It has the best airflow adjustment (Clicking ring like the Nautilus, but with 7 holes from tight draw to straight lung hits), you can remove the deck without having to empty the tank, and it works great on subohm and temperature control builds. Plus it has swappable decks including one with extra wide juice channels which is perfect for high VG juices. The design makes building and wicking nearly fool proof, fast, and easy. By far the best RTA out there IMO.