there is a reason these servers are split. I see EU people talking about playing on the NA servers, and NA people talk about playing on the EU servers. Please dont be that person. you just lag out the other servers.
if you live in EU, play on EU. If you live in NA play in NA.
the skill levels will be the same regardless to what you might think, NA guilds are not better then EU guilds, we seen this in many games like guild wars 1, etc.
EU will have just as strong guilds as NA and vice versa. And if you play on the wrong server, you are just putting yourself at a disadvantage.
I recomend you start with your designated server, and see how that goes before you even think about rolling on the other.
personally I think the NA servers are going to be a lot more annoying then the EU servers because NA is going to be full of a lot of no class US scrub nubs. (yes I live in USA and we all seen this in other games)
the biggest problem comes into the big sieges, and this is where the lag happens, if you are on the orrect server you will see less lag, so please roll your characters on the correct servers.