used vuforial really long time ago… then the licensing ruined it, but the tracking was ok from what i remember…
ar foundation, have same issues with models sliding, not usable for any kind of precision requiring work…
(or at least havent found the settings that would improve it)
Yeah exactly have that sliding problem as well. Can you recommend an alternative or a working framework for AR and Unity. Its gonna be quite some projects 
still looking also… would prefer something that can track point cloud or model based tracker.
hololens 2 ar demos look pretty impressive, how the tracking is exact… not sure how they do it and why it wouldnt work on mobiles (like ipad with lidar?)
Well, right now I am working with Vuforia with size of object spawn with image target around 100m+ and it is working fine.
I would have recommended Unity MARS but recently its image marker tracking going little south and scene changing causing issues but you can keep track of that as if the issues get solved, it can go smooth and help you in future.