If I want to build a crossplatform AR app (iOS and Android) which AR SDK should I use? I know Apple just demo-ed ARKit at WWDC and it's very impressive but it's not cross-platform, though I might eventually develop two apps (iOS on top of ARKit and Android on top of something else. I've cursorily examined Vuforia and EasyAR but I'm not really sure.
Edit: Unity support would be nice :)