Basically nothing that i can think of. Especially when it comes to power efficiency...

If its about hardware performance, (e.g for doing ML research on the go ) the Razer Blade 16 or 18 with RTX 5090(mobile) are the best i know of ( and own ). But this comes with way worse battery life ( and of course since the RTX 5090 gives you about 4-6x the performance that a M5 MAX gives you for ML training/inference this is kind of justified)