Apple have less constraints so their API is more straightforward (less abstractions) and less verbose, Vulkan give you more control, but at the expense of a more convoluted, verbose and complex API, people like to joke about the amount of code one need to write in order to render a triangle with Vulkan

These are still very abstract differences.

Though arguably, going from first triangle to a semi-complex scene is relatively few additional lines, for what it’s worth.

I am not convinced that Vulkan gives you more control. Metal is adaptive in the sense that it can manage some state and configuration for you, but that is strictly opt-out. You still get your manual memory management and low-level event synchronisation.

On the topic of control, Metal has precise control over display intervals and presentation timing (I think Vulkan recently introduced something similar, not sure).