Is there a best practice for sidebar width on mobile?

What is the best practice when it comes to sidebars and user experience on mobile? Is it better to have one that is full-width or one that is 85% width with 15% backdrop? What are the benefits or downsides of either one?

Currently, I do it as in example 1 below with width of 85% and max-width of 360px (so it limits the width on bigger screens), but I was wondering whether I should change it to create a more app-like experience.