only install Leopard, GUID or MBR, which one is better?

[Misa]

I'm using Windows XP, and I intend to erase windows, only install Leopard on my laptop. So could you give me an advice of what kind of HD should my HD be? GUID or MBR? My HD is 40gb, with 2 partitions.

Furthermore, is pre-installed EFI is a requirement before installing Leopard? I have 2 versions of Leopard now, Kalyway and ToH, which one is better for my laptop?

These are 2 laptops on which I want to install Leopard:

1/ DELL Latitude D600 - SSE2:

Pentium M 1.6GHz, 1GB RAM, ATI Mobility 9000 VGA card.

2/ DELL Inspiron E1505 - SSE3:

Intel Sore Solo 1.86GHz, 1GB RAM, VGA card on-board.

 

One more question, which laptop can use vanilla kernel?

I really really need and appreciate any advice for a noob like me.

Thank you for reading.