Just to clarify, I’m not saying the anime is bad - it does as much as it can with the limited time it has (12 episodes planned if I recall correctly). It’s just that there are 11 volumes (or 95 chapters) of the source materials and the story isn’t even finished there. There’s just no way to fit everything into the show.
What it does show is done pretty well and that’s what I was the most worried about before it started.

If you want to read the manga then by all means do so - it’s great and the missing content does flesh out the characters and world a decent amount. If you do like the show however and are just worried about missing context or important info then I think you should be fine sticking with the anime (maybe jumping into manga afterwards if you feel thirsty for more).

Neither is a bad choice based on what I’ve watched so far.