I’d say the Canyon was best VFM of those, i’ve got a Strive and it’s a fantastic bit of kit for not a lot of money given what the equivalent mainstream brands would charge.
For a first FS bike though i’d be hard pushed to drop that much unless I was cock on sure it was right. I was happy enough taking a punt on mine given that after having 6/7 bikes before it I knew what geometry/measurements I needed, and even so it needed a bit of tweaking o get perfect.
I’d suggest going and trying the usual first bike suspects, giant trance/anthem, trek/specialized etc as you’ll get easy demos on them and then you can probably find last years model at a sizeable discount.
Edit: On the brakes – I bought mine and was going to order a set of XT’s to change them too. I never bothered, braking performance is just as good on the Avid’s, modulation & feel is better. They are noisy if they as much as look at water though. Biggest perk is the cockpit – the 1 shared mount system is fantastic with the shifter right and reverb left.