FireWire 800 Vs SATA in PC laptops ?

Cardbus expansion cards are available nowadays for a variety of
connections : FireWire 800 (ieee1394b), Serial ATA, USB 2.0

I would like to know how a PC laptop can really benefit from these in
the real world of editing video and audio.
What are the specific advantages of FW800 Vs serial ATA in a Cardbus
connection, and are they 100 per cent compatible with Windows XP ?

My T23 laptop has two USB 1.1 slots and 2 cardbus slots.
Since one can't have all in a PC laptop, which two out of three would
give me the best possible performance with a DVD writer and an
external hard-disk:
FW 800 and USB2 ?
SATA and USB2 ?
FW 800 and SATA ?

Not only isn't there yet a FW800+usb2 combo card but also depending on
which two cards are used they may not fit physically in side by side
PC card slots.

Any ideas ?