In terms of 3D speed the options are between the S3 Savage IX/MX, ATI Mobility Rage/Radeon, Geforce2 Go.
The Savage IX/MX is about the same speed as a Savage 4 graphics chip - I say about because of the way it shares memory with the system memory, etc.
I think its the IX which has memory integrated with the graphics chip for frame buffering, etc., as this means its not fighting for memory bandwidth with the CPU and other things.
ATI Rage Mobility is a bit of a mix. Be careful, they have a low performing mobility part which I think the M1 comes under. The ATI Mobility 128 is an acceptable graphics chip and is based on Rage128 Pro technology.
The Mobility Radeon is obviously based on the radeon core so has ability to perform.
The Geforce2 Go is also a capable part, but there are 2 different versions. One has 64-bit DDR memory interface, the other 32-bit DDR memory interface and hence a lower memory bandwidth which will effect games. This is the same sort of situation as the MX400 and MX200 on the desktops.
In terms of which is the best at the moment, the Radeon mobility seems to have the performance edge.