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With regards to your question about Google's VR Tour Creator. Keep in mind Google basically has walked away from VR. They open sourced Cardboard and are leaving support to community efforts. So using an engine like Unreal, even a slightly older build, is likely your more straightforward option to getting an experience for VR.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.