1 - No, Pyro Powertechs are very squishy, and so are Snipers. Tanking Powertechs are not squishy, but their dmg is no where near snipers.
2 - Similar numbers, different ways to apply it. Both very powerful DPS classes, I would say Powertechs are better off right now though.
3 - Depends on what spec you go. Powertechs have a pull which is great in huttball. Snipers have the best AOE cap stopper in the game + they have a greater range.
Play style will be the deciding factor...but as I said, Powertech gets the advantage in pvp right now, at least judging from the top teams and the numbers.