Guild Wars 2

So I have decided to come back to GW2, I played for about 1-2 months after release and for PVP only so I never got to experience the actual world.

I have been theory crafting builds for weeks and have come up with 2 different ones that sound extremely fun to me. My question is which do you find more valuable to your high level fractal GRP/WvW?

A Tanky Axe+Mace/LB Warrior which provides group heals and boons through shouts?

or

A remotely Tanky Grenade Engineer which provides 100% 25 stack vulnerability, massive AOE damage, as well as group condition removal?

I played the game for the first 2 months after release but purely for pvp. I now want to return to the game but for pve pvp and wvw all casually. Although i am casual i enjoy being competitive which leads to my question:

Which professions have some fun builds which can compete dps wise but also provide some grp support such as shouts venom aura or elixirs? I would prefer play the same build for all aspects of the game. I enjoy playing a class people are happy to be grouped with not only for damage but support as well.

Also, as a side question how would you rate the overall success of this game? As well as do you see it as the type of game which will continuously improve or sooner than later die off and be forgotten? To put it into perspective how would you rate its success and player base vs games like rift or swtor or even wow if you dare.