for people sticking to rxTools lets look at it this way.
rxTools = Windows XP SP2/SP3 , Great for its time Held out for a long time and was teh most stable thing for an OS (or in this analogy a CFW) but time marches on, Improvements are made, patches and workarounds to newer cockblocks by nintendo, and patches for things we didnt think possible back then. it has hit EoL, teh advent of A9LH time School and Life has had the Dev haveto End development. it's dead in the water and a ground up re-write is needed to make it good again with Community Support.
Luma3DS= Windows 7, the New Rock hard setady OS, the pillar of stability as an OS (again in this situation, CFW) New features new optimizations Protections against FIRM0/FIRM1 Overwrites , Preservation of A9LH and a damn great CFW for Menuhax users, New features will build upon and will be integrated into Luma, and will beLong term support for years to come.
4.5 stubborn MSET users = Windows ME, Bloated Unstable Unoptimized Garbage in the modern Times.