Guild Wars 2

Hey guys. Apologies for the nubbish questions, been trying to find answers online and here on the forums but unsuccessful, not sure if it isn’t there or I just didn’t look well enough, probably the latter.

So, I’m just curious; the T3 tier cultural armours and weapons sure look good but I’m wondering what better armours and weapons exist in terms of stats? Also, by hiding the helmet, the stats are still present, correct? Besides that, what should one put in the armours and weapons and does a dual sword style work well for warriors?

My other question has to do with PvP. Now I understand that in regular PvP everybody is more or not equal, but when it comes to WvW, I’m curious what exactly is different between a level 80 PvPer and a level 3 beginner? Besides skill and experience, of course. Also, the server-shifting baffles me. I’m not 100% whether your characters stay or disappear. I’ve done it once, months ago, and managed to keep my characaters with no cost but now I read somewhere that to keep characters you have to pay something?

Thank you very much for your time!