I am using Google Cardboard for Unity and will be using my iPhone 11, but I am not sure which option to choose?
Here is the quick start guide
Following the instructions, it says to choose 3D. I would do that for now.
“3D” is the built in render pipeline. I can confirm that works with cardboard sdk.
Universal render pipeline might also work (the newer render pipeline, also 3d), but you can always upgrade the project to URP later if you end up needing a feature that URP has.
Cardboard sdk is very slowly supported, its barely usable in its current state honestly, for that reason i would for sure go with 3D, default render pipeline until you hear otherwise for max compatibility.
HDRP is not really for mobile so dont use that.
The newest cardboard sdk is choppy on a lot of devices compared to the old google vr sdk. A user just reported a supposed fix for the chop a few days ago months after its reported…so thats kind of the state its in.
Im still waiting for that fix its basically useless on my pixel xl4 as its just not smooth.