In terms of visual fidelity it's going to be a day and night difference, quest 3 definitely worth. Fullbody outside of the SteamVR ecosystem will be tricky, you *can* connect with your steam trackers but you will have to do a circle-8 with tracker and controller to sync playspaces once in a while.
You can buy an additional tracker and attach it to your HMD to solve that issue though. www.youtube.com/watch?v=Ckf3... There's of course the IMU-based trackers, like SlimeVR, but they have their own sets of drawbacks so do your reseach. They're cheaper but will never work as well as the HTC ones.
OpenVR Space Calibrator that was mentioned:https://github.com/bdunderscore/OpenVR-SpaceCalibrator3D Print Model that my friend is using: https://www.thingive...