Guild Wars 2

If you’re new to the game and don’t wanna spend much time with alts and such, I’d recommend warriors.

Easy access to both power and condi builds.
Good mobility in open world with GS / Sword / Warhorn.
Large health pool.
Contender for top DPS.
Wanted in basically every group due to their passive traits and banners.
They will essentially leave you plenty of room to learn the game so you can decide if you want an alt later on.

Guardians are similar, albeit different. They’re relatively tanky too, not so much through pure beefiness but passive profs, boons and such. In spite of their name, they’re a lot more selfish than Warriors in their playstyle. They are presented with lots of options to stay alive and deal damage. What they’re lacking most is mobility, and I don’t see that changing anytime soon. So keep that in mind.

Necros are the most selfish out of all. They offer little to no support to their team. They are valued, however, for their unique ways of dealing with enemies, especially at higher levels where conditions become a thing (and Necros are the masters of conditions). They can quite easily faceroll open world content due to their minions. They are the least mobile class in the game. (they have no movement skills and their only speed boosts come from a signet and a wh skill which, coincidentally, also deals ticks around you – this proves counterproductive most of the time, as it’ll aggro mobs, putting you in combat mode and reducing your speed drastically.