Android, iOS or ?

Hi, I want to ship a Unreal Engine, VR APP (Archviz Scene) online where I can send clients a link to a website where they can view and interact with the the APP in VR from their phone whether it be iOS/Android etc?

What do I package my APP in Unreal? iOS, Android, Google VR?

Can I do this using Pixel Streaming?

How will clients control the App if they are using Google Cardboard or Daydream etc?

Please, if anyone can help it would be great, thanks.