Bi-boot XP + Vista : 2 or 3 partitions ? and which volumes for each one ?

Hello,

For is a Bi boot XP home SP2 + Vista Premium mce, is-it better :
2 or 3 partitions?


I am explaining :

Solution (1):
Partition 1: XP (advised Volume: 10g ? , ntfs)
Partition 2: Vista (advised Volume: 20g ? , ntfs)
Installation of Vista after XP for Bi-boot creation

Solution (2):
Partition 1 for the bi-boot small files (advised Volume: 500 K ?, Fat32 ?)
Partition 2: XP (advised Volume : 10g ? , ntfs)
Partition 3: Vista (advised Volume: 20g ? , ntfs)
Installation of Vista after XP for Bi-boot creation


Thanks for any idea, info & experiences : -)


Jean-Max


PS : I used with success solution (2) for a bi-boot 98SE + XP on a game PC
(old & new games)