Probably can’t go too wrong with any of them, but here’s a value comparison if you’d like: https://99spokes.com/compare?bikes=scott-genius-930-2021;*z.MD%20High|w.29,canyon-spectral-29-cf-9-2021;*z.MD|w.29,specialized-stumpjumper-evo-expert-2021;*z.S3|w.29
I think the Spectral will give you more bang for your buck (make sure it’s the 2021 version), but the new Stumpjumpers have gotten great reviews as well.
I’d also make sure you know what terrain you’re riding, that you’re comfortable with your price point, and that you know what’s in inventory these days. Just starting out, you can certainly get a very adequate bike for much less.