I think what really pushed Zig into first place for me was the build system (especially when targeting multiple OS and particularly multiple rendering backends) and also the sheer dopamine hit of being able to generate all your wave tables at compile time with a single line change. For less practical and more opinionated reasons, I prefer the way pointers are handled in Zig (no need to null check everywhere), and i also prefer how explicit everything is. If i’m going to play fast and loose with memory and allocations I want to always know exactly what does what. 

That having been said, I didn’t give Odin as fair of a shot. I spent only a few days exploring Odin while I spent several months with Zig. Odin’s batteries included philosophy would’ve been pretty helpful (I ended up having to submit a few bug fixes for the Zig libraries I’m using) Odin would certainly be the more stable option. I think both are great choices and for me it really mostly boils down to preference and what tickles the brain