Red has a huge xp bonus, and that may interest you as a casual player without a ton of time to level up, especially at 30+ when things can start to slow down.
And no, you won't be getting ganked all the time by high level players
[You must be logged in to view images. Log in or Register.] I believe the level range changes based on your level, from 1-20 its only like 4 lvls, 20-30 is 6, 40-60 is 8? something like that.
Red has a much lower population but a global ooc channel to make up for it. Definitely a lot of fun if you can get past the drama some of the higher lvl players/guilds have.