A Genesis tank is a type of RTA that is designed for using a rolled SS mesh, similar to that of screen doors. It has its advantages such as not having to replace it very often, but it also has its "CONS" its the the easiest, it can be frustrating, It can have wicking issues and hot spots , leg issues. Also you have to do the genny tilt so you get no dry hits, and yes they cant be kept on its side for the most part.
There are lots of YT how to's .
I finally was able to get a Genesis going, but I would not recommend it if you are still newish or even at it for a year or so.
Dripping vs RTAs. the gap has closed in my opinion. There are many RTAs out there that give you the same taste , same warmth etc as a dripper, minus the constant dripping. A good RTA can give you the best of all with the added convenience of being able to have an "on the go" atty with no leaks and up to 5ml capacity.
I do have a couple drippers. 2 Origens for my gross NET liquids and one for testing out new flavors.
I have used the same liquid in my RTAs and on the RDAs and there is no difference.