Cisco dual stack CE BGP configuration suggestions

[Roger Wiklund]

I'm putting togheter a template for CE/CPE router config with dualstack and BGP.
Silly question really but just thinking what's best for future use
etc. To have "Router BGP + address family ipv6" or "Router BGP +
address-family ipv4 + address-family ipv6"
I think I preffer to have both address-family on both ipv4 and ipv6.
Is there something I may have missed using this style?

router bgp 192
 no synchronization
 bgp log-neighbor-changes
 redistribute connected
 redistribute static
 neighbor 192.168.1.1 remote-as 65000
 neighbor FD85:A55C:FDCB::1 remote-as 65000
 no neighbor FD85:A55C:FDCB::1 activate
 no auto-summary
 !
 address-family ipv6
  neighbor FD85:A55C:FDCB::1 activate
  redistribute connected
  redistribute static
  no synchronization
 exit-address-family


OR

router bgp 172
 bgp log-neighbor-changes
 neighbor 172.18.1.1 remote-as 65000
 neighbor FD85:A55C:FDCB::5 remote-as 65000
 !
 address-family ipv4
  redistribute connected
  redistribute static
  neighbor 172.18.1.1 activate
  no neighbor FD85:A55C:FDCB::5 activate
  no auto-summary
  no synchronization
 exit-address-family
 !
 address-family ipv6
  neighbor FD85:A55C:FDCB::5 activate
  redistribute connected
  redistribute static
  no synchronization
 exit-address-family