Also Cloudborne (after doing a bit of research) was the busiest beta shard. Seems likely a lot of people will stick to the same shard hoping to see the same people they met during the beta.
From a few googles it seems that a lot of guilds are talking about Cloudborne, including goha.ru - apparently a MASSIVE community of Russian players. There also seems to be some talk from the Aion community about guilds migrating games and rolling on Cloudborne.
I know it's all speculation at the moment, but the impression I'm getting is that Cloudborne is going to be the focus of competing raid guilds and Russians. Not that I've anything against Russians, but it the Russian gaming community decides to make that the server they all roll on.. well it can cause problems.
My WoW realm - before the Russian servers went live - became the focus of the Russian gaming community and 1 out of 3 guilds was Russian speaking only. Almost every day we'd encounter a party member who couldn't speak any English, but was propped up by his guild.
If goha.ru are headed there and WAR's and Aion's top raiding guilds are heading there, my suggestion lies STRONGLY with Whitefall.
I know you get trolls, people who don't speak english, raiders taking it all too seriously and the like on any server - but from early speculation it looks like Whitefall is going to have the least.