Right now Atmo just sounds Lineage OS with lots of derivative, but also with lots of broken or missing features. What I want most from this OS is backup loader and cheat engine, and so far TX delivered half of that. It's a small price to pay to be an early adopter.
Eventually Atmo will come out, but it will miss out in the essential features i initially, and I'll hold off on using it. Tx will obviously copy the codes (and refine it maybe) and incorporate in their OS with the essential feature still there.
So until a free, unencumbered, and smooth back up loading function is added to Atmo, obviously TX win at this point.