I'll second the Lemur Pro.

I really like mine. Everything worked out of the box, and I tend to get ~12 hours of battery life.

The System 76 Pangolin might be an option, too, if 15" isn't too big. There is a decent, recent in depth review here: https://arstechnica.com/gadgets/2023/05/review-system76-pang...

For what it's worth, System76 are the first linux laptops I ever bought (and I've bought so, so many) that felt like it Just Worked. I recommend.