look dude currently if you want battery focused system go for either snapdragon or m series macbooks.
there are no valid logic to buy old intel bcoz of slower performance than new-ish amd systems and current corrupted intel based machine will die but you don't know when and why. so only option is good right now is amd. I am using it since last 10 years. no major issues. latest amd cpus are far better and more battery focused x86-x64 architecture.
If money is not a problem for you and battery life is priority then go for m2 macs, those will any job easily. hope this helps you out.
Tab form factor - Apple M4 🔥
Phone form factor - Snapdragon 8 Gen 3
Laptop form factor - Intel® Core™ i9 (Yes, I'll still put my money on Intel!)