Pick T1 or T2 (for NA)
Do you mean outfit? You can use that on any character via your hero panel.
T2 WvW is fine, especially if you’re in NA primetime hours. Roaming is far more active on T2 than T1. It’s not worth the transfer cost unless you discover you’re not getting what you want for some reason.
Also anet is working on some big WvW overhaul that they refuse to talk about, ETA TBD.