I haven't had a chance to try the Nixon yet but I am hoping it can come close to the Magma.
I would also like to respond to my own post on this.
The Nixon is ABSOLUTELY INCREDIBLE. The only down side of the Magma is limited airflow, you don't have this issue with the Nixon RDA, I am having to adjust it's airflow down. It is giving me the great flavor like the Magma and the warm vape also, I bought mine off of Fleebay and paid $23 for it (it is a EHPRO) there are clones on there as well for one to two bucks less and I have no idea how well the clones work.
The Magma does offer the ability to only use one air hole while the Nixon does not. I am using a single coil on the Nixon 28ga. Kanthal / .7ohm / parallel coil on a Infinite brass Cartel clone (single 18650) what a wonderful setup.
Pros: for the Magma:
1. Single/dual air hole for single/dual coil builds
2. More room to bring the cotton down into the well than the Nixon
3. Holds just a bit more juice in the well than the Nixon
Pros: for the Nixon
1. Price, $23 for an authentic RDA
2. More airflow than the Magma
3. Comes with both a 510 drip top/tip, as well as a Delrin top cap.
4. Four post deck to build on