What build for my future gear.
Depends what do you want to do. World pve ends in level 80. You have dungeons, fractals or living world events. For dungeons i suppose berzerker is the best if you want the most efficient build for fast cleaning dungeons, but pve in this game is too easy anyways, any build work. For high level fractals i dont know.
In wvw depends what you want. And the build change a lot depends on that. The most populars builds right now is altruistic healer and healway (you can find it in this forum). I feel for frontline in zerg or roaming is better AH, and for support in zerg or support in some roamers party is better healway, really depends in your playstyle, you need to play a lot to find your way to play and adopt a build for you and custom it for your needs.
I find, after a lot of wvw, the better stats for my gameplay, how much defense or offense work well for me, how many heal, armor, power, critic, healing…
If you are new and you want to play in zerg healway is a great choice for that. You have a lot of survivability and help a lot as support.