Ayush.

I think SceneKit is easier to find your footing because you can write and run code on the simulator. RealityKit/ARKit need a real device. I think SceneKit is also a little easier because there is less ground work to do to get things rolling — at least that is what I am finding.

I have written half a dozen articles on SceneKit on medium. I will be covering ARKit/RealityKit in the near future — although maybe not until after the WWDC 2020.

Mark