block external requests via NAT — destination address "!LAN address" vs. "!This Firewall (self)"

[tinfoilmatt]

the documentation guide says to use "!LAN address" as the destination address. any reason/s, for security or otherwise, to use or not to use "!This Firewall (self)" instead?

(i understand that "This Firewall (self)" already contains both IPv4 and IPv6 loopback addresses, and also includes addresses not assigned to the selected NAT interface.)