There definitely are good build quality laptops out there, like the Zephyrus lineup. Don't know about their latest releases, it would require a bit more research.
My own laptop is a 2022 model of zephyrus g15. It was released a few months before m2 released. The CPU is a Ryzen 9 6900HS, that is just 4-5% slower in cinebench, and a 3070-ti gpu. The GPU is 20% slower than m2 max, but the laptop also cost only 2.4k, compared to 3.1k of M2 max. The battery lasts around 4-5h during video playback on the dedicated GPU.
Haven't tested the energy saving method as I use it for work and I have locked it to max power settings.
Yes, the mac is more power efficient, but at the same time, if I wanted a power efficient, light laptop, I wouldn't buy a powerhouse.
Edit: oh, and the zephyrus laptop is actually lighter than 16" MacBook pro
Yup. Also some kernel panics due to non compatible DP adapters. They are picky machines. Those issues were with the 2019 i7 mac pro. My current M1 has issues with certain usb-c docks