Orion was my daily driver on iOS/macOS for a fair bit ~8 months ago. It wasn’t the most stable and didn’t block ads reliably in YouTube videos either. Planning to give it another shot next year. I certainly like the Kagi ethos better than Brave - the product functionality just wasn’t there yet.
I have youtube premium so I guess I hadn't noticed. it seems perfectly stable and usable to me though so maybe you're more of a power user than me. I do most of my browser on a laptop to be honest