🔅 Stop asking for the best ROM or kernel (for battery, for performance or any other criteria), it doesn't exist. If there was one true best ROM or kernel, do you think there would be other ROMs or kernels?
🔅 There is only subjectively best and that's different for everyone. Everyone has different usage patterns and preferences, so when asking for the best, you get the best for them, not the best for you. The only way you'll find the best one for you is by trying them yourself. They're all free, anyway.
🔅 Also, keep in mind that the devs are not competing against each other and they're not trying to win you over or anything. They all have different design goals, they're not trying to be better than one another. They're just trying to be different. Asking for the best is quite disrespectful towards the devs.