In this case Windows is the only sane choice (at least based on my experience from 2 years ago).
After a lot of reading random docs, I got to a point where I could stop the GPU from eating the battery doing nothing, but I could only disable/enable it by logging out then in. It was either no GPU at all or a GPU drawing maximum power, no in-between.
Maybe Nvidia's latest code releases will help with that?
I've only had an Nvidia GPU laptop for 2 years so no experience of using older series of drivers, but Nvidia's 5xx series of drivers work great on my T460s running the latest Mint, drivers installed using the Ubuntu driver tool.
Secure boot works out of the box, prime render offload works without a hitch (and no need to log in/out to switch GPUs), battery life is ballpark similar to Windows.
In this case Windows is the only sane choice (at least based on my experience from 2 years ago).
After a lot of reading random docs, I got to a point where I could stop the GPU from eating the battery doing nothing, but I could only disable/enable it by logging out then in. It was either no GPU at all or a GPU drawing maximum power, no in-between.
Maybe Nvidia's latest code releases will help with that?