[AndrewKemendo]

Not sure what you are asking because XCode is an IDE and Unity is a 3D engine. You would be using both on an iOS project. You'd export your unity project to an XCode project then publish the .ipa from XCode.

Are you wondering if it's better to use OpenGL/Metal instead of Unity? I'd say stick with Unity unless you've written a shader before. You're not going to build an optimized 3D/AR app without quite a bit of experience.

[mendeza]

Well the Example ARKit app is based off of scenekit, which is a wrapper for Metal. Scenekit is a more natural choice to people who have background with Three.js or want to develop more with code.

Ive been developing ARKit stuff solely with scenekit, and I enjoy it. I would like to learn unity, but I dont see a point now cause of the high learning curve to learn unity and since ARKit is iOS only, no point in using something thats cross platform. But would love to hear of any feedback on using Scenekit vs Unity!