Fedora xen - Sep 2006 - multiple nic''s with vlan -> bridge or bridge -> vlan

Hello,

Whats the experience with multiple nic''s and
vlan''s/bridge''s for xen guests
?

Is it better to build network configs for xen guest''s with:

eth0 - vlan''s - bridge''s - domU''s
eth1 - vlan''s - bridge''s - domU''s

or

eth0 - bridge - vlan''s -domU''s
eth1 - bridge - vlan''s -domU''s

regards,
Thomas