I'd give the advise of maybe looking into a less populated server. There's no real way to tell for sure, but on PC launch there were some servers that became full very fast and locked because of it. There's the possibility that maybe it might happen again during the PS3 launch and your friends might have a delay on getting on the server you chose.

Otherwise pick what you feel like going for, or find out what servers seem to have a better population for what time zone/country you're in.