I evaluated both some time ago. The standout difference for me was Zig requires you initialize all variables and struct fields explicitly, but Odin implicitly initializes variables and forgotten struct fields to their "zero value" (0/null).
Funny you should say that. I don't find it painful at all, I prefer the explicitness. I just wanted to relay my experience without unnecessarily bundling my opinion, since this is a thread about Odin after all.
How do they compare?