Ryzen AI Max+ 395 and the Ryzen 9 9945HX3D are 2 different options for me.
- 9945HX3D need a dGPU => more for gaming laptop.
- 395 => do not need a dGPU so the expansion bay is usable for more ssd.
For power, I do not think that the Ryzen AI Max+ 395 need more power than the actual CPU+dGPU => so not an issues for the battery.
For termal dissipation, Strix halo with 8 core and 32 cu may be usable without cooling re-design . for the hight Ryzen AI Max+ 395 it may be needed to have a new cooling .
My interest for Strix halo is the memory. It look to be a dual LPCAMM2 so ~ quad channel and 128+Go of fast RAM. It may be really good for big local LLM. So can be a good developer laptop with local coding help and more… and compete with Apple M3/M4 
But even the “small” 8 core and 32 cu can be nice for that.