I would suggest holding off on buying an ARM laptop specifically for Linux at the moment (maybe not too long from now though). Although there is an increasing amount of support, it’s still not fully there, and there is most likely going to be quirks here or there that can throw some issues you would rather not deal with on a daily driver machine (e.g. having to extract firmware from the Windows partition in order to get some features working for the Snapdragon devices). Probably your best combination of power efficiency and performance on x86 at the moment will be something like the Ryzen AI 300 series CPUs. If you like ThinkPads, I would suggest the Ryzen version of the T14s Gen 6, which is essentially the same as the ARM version bar the CPU. I’ve been using a P14s (very similar to T14s just with some tweaks as it’s marketed for mobile workstation users) Gen 5 and even with the lower capacity 39.3Wh battery (compared to the 57Wh battery you can get on a Gen 6) I’ve easily been able to get 6 or 8 hours in the balanced power profile with ~70% brightness on Fedora, so probably the T14s Gen 6 can do 10 or 12 hours on a charge.