Which is cute until you want to share files between the OS's...
GRUB is supposed to have some advantages over lilo, but small setups probably won't notice. In general, stick to the evil you know.
I have GRUB in a boot partition, set up by default, and linux shows first in the boot order. It is simple to change them round - a matter of cut and paste. The first one is the default, hit enter iffin you don't want to wait.
I tried Lilo a while back, but changed back to GRUB 'cause it looked nicer