PVE servers are for the scaredy cats who don't like a bit of action while they play the game
No...seriously.... The play style is the same, and many people on PVP servers also get to endgame and then focus on PVE.
It's all a matter of personal choice.
I personally prefer a PVP server because it gives me an extra adrenaline rush when i get surprised by the other faction whilst questing.
For me, that makes the game more exciting and fun
I don't get the feeling of being 'ganked' as many people talk about, as I try to put up the best fight I can.
If I keep losing the fights, then I just log an alt and go my merry way (until I get an alt that can win the fight .... thats when its my turn )
I tried playing PVE servers in other games, but found that lack of adrenaline rush made it somewhat boring, and purely a gear grind.
As I said, it's all a matter of taste.
Hope this helps