Since everyone is naming their favorite class, I'll throw my 0.02$ in.
For leveling 1-70, if you're not boosted, WD is probably without a doubt fastest (Locust Swarm for the win).
For the set dungeon, DH is probably easiest, as well as the initial gameplay (Torment 6 ish).
For the solo GRs, WD and Crusader will probably have the easiest time to get to GR70 - at a certain point the wizard surpasses them and by GR80-90 all classes become incredibly hard, except for the wizard. Again, it's a "bug" though, and not everyone enjoys this, but for 2 weeks you probably won't push into 90+ and for anything below 80 all other classes can do that, and I think WD+crusader are easier there than wizard.
The easiest conquest is Boss Mode (very easy for WD solo) followed by Curses! (DH).
Overall, I strongly advise to play WD, DH, or Crusader for those ~10 days depending on which of the three classes you like (magic, ranged, or melee). Wizard really only becomes broken and powerful in endgame, which you won't get into in 10 days remaining. And if you want to play in a group, no one will group up with a low paragon wizard anyways, you're better off playing any other class.
What do you mean by "this season"? Currently it's season 6, but that will be over in 13 days from now.
Unless you play over 100 hours or have friends who push you like crazy, you won't feel major differences among the classes. In S6 endgame the solo wizard can go significantly higher than any other class due to a "Firebird bug", though it's a sort of cheap mechanic and up to you if you want to play it. But that being said, it really doesn't matter in the first 100 hours of a season, roughly, and since it's only 13 days left that should not concern you.
S7 starts August 5, and it's too early to tell which class will be best in S7.
Since everyone is naming their favorite class, I'll throw my 0.02$ in.
For leveling 1-70, if you're not boosted, WD is probably without a doubt fastest (Locust Swarm for the win).
For the set dungeon, DH is probably easiest, as well as the initial gameplay (Torment 6 ish).
For the solo GRs, WD and Crusader will probably have the easiest time to get to GR70 - at a certain point the wizard surpasses them and by GR80-90 all classes become incredibly hard, except for the wizard. Again, it's a "bug" though, and not everyone enjoys this, but for 2 weeks you probably won't push into 90+ and for anything below 80 all other classes can do that, and I think WD+crusader are easier there than wizard.
The easiest conquest is Boss Mode (very easy for WD solo) followed by Curses! (DH).
Overall, I strongly advise to play WD, DH, or Crusader for those ~10 days depending on which of the three classes you like (magic, ranged, or melee). Wizard really only becomes broken and powerful in endgame, which you won't get into in 10 days remaining. And if you want to play in a group, no one will group up with a low paragon wizard anyways, you're better off playing any other class.
What do you mean by "this season"? Currently it's season 6, but that will be over in 13 days from now.
Unless you play over 100 hours or have friends who push you like crazy, you won't feel major differences among the classes. In S6 endgame the solo wizard can go significantly higher than any other class due to a "Firebird bug", though it's a sort of cheap mechanic and up to you if you want to play it. But that being said, it really doesn't matter in the first 100 hours of a season, roughly, and since it's only 13 days left that should not concern you.
S7 starts August 5, and it's too early to tell which class will be best in S7.