In this situation I proably would just go for the most afforfable option, for example a Linux distro that most suits your needs (have a check at website like distrochooser[.]de or similar website), and then ask LeChat or ChatGPT for advice on how to optimize the power settings

https://distrochooser.de/

Edit: not really for this purpose. But maybe you can ask ChatGPT or European https://chat.mistral.ai/chat