Elementalist or Engineer?
Engi is strong in PVP, good in PVE and ok in WvW
Ele is strong in PVP, PVE and WvW
If you’re looking just at the effectiveness Ele all the way, if you can handle it (they’re squishy). I find my Engi a bit more fun which is why I usually play it.
I can only speak for myself, but I leveled Necro to 20 (without pets, btw), and tried Guardian, Thief, Ranger and Elementalist to 15ish. All were fun, but the Necro was my favorite. I then deleted my Ranger and Elementalist and tried Engineer, even though I’ve heard it’s a tricky class to play. Now I’m level 21 and doing quite well. It’s by far my favorite class, even putting the Necro down to second place. (and trust me, hearing a cute Asura girl yelling: “I am death incarnate!!” never gets old, hehehe.)