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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
It probably depends on what you want to do and if you want this to be a career. If you want to do this as a hobby and the functions you need are described in this toolkit, then I would give Godot a try as the fastest way to try your idea and get up and running and have fun: https://github.com/GodotVR/godot-xr-tools/tree/master/addons/godot-xr-tools/functions. If you want heavy physics based actions like boneworks with a full body avatar, then yeah go unreal or Unity. If you want to try to get hired by a VR studio, then unreal or Unity.