Post by UncaToddly
They can all be fun. It also depends on what you are looking for that defines your "fun".
If you are looking for a very active PvP community then going to a realm that does very little PvP won't be much fun to you. By the same token, if you only like to play Alliance going to a realm a 5:1 horde:alliance ratio isn't going to be very fun for world pvp either.
Maybe you like to roleplay, if so then picking one of the RP realms could be good. Conversely you could think roleplay is retarded so if someone recommended their RP realm it wouldn't likely be much fun.
Or perhaps your idea of fun is playing the AH so to have fun you would need a vibrant economy.
There are too many things we don't know. It is like when people go in trade chat and say "LF Good Guild". Well, are you looking for an up and coming guild to help build? One that is well established and has lots of members? One that is a very social guild with no pressure to do things with the guild? A PvP guild? One that focuses on dungeons and raids? A middle of the pack raiding guild where it would be likely you could have a spot in a raid team? A High End raiding guild that is on the bleeding edge? ALL of these can be GOOD guilds but it doesn't mean they are good for the person seeking them.
The same goes with "what is a fun realm"? You want to find one that is relatively even in population unless you simply want to be on the dominant side. You can see the realm populations at http://wow.realmpop.com
and simply pick US or EU servers. I was looking at US today.......I don't recommend Illidan if you are Alliance :).
Beyond that, take a little time and play a few characters to different realms and if you don't feel it, delete and try again. Not everyone likes the same things. Kinda like looking for mates. For every guy out there who loves a thin little girly girl who is all about shopping, painting her nails and working on her tan........there are others who want a larger gal who prefers to go rock climbing, hiking, fishing, hunting and can properly field dress an elk she just killed with a bow.