Newbie Weapons Questions

[Questor]

Hi Everyone, I've only been playing the game for about a week now and I'm totally hooked. I wish I would have heard about it sooner. If it wasn't for the review in PC Gamer I may never have.

Anyways for my questions...

1)Is there any difference in accuracy between different weapon types?
2)Would there ever be a reason to use a weapon that does less damage at the same range while all other stats seem to be the same? Example, why would I want to build a troop using Ground Cannon 1 when I already have access to the Small Depleted Uranium Cannon 1?
3)Does something determine weapon accuracy or is the chance to hit the same for all weapons?

Thanks,

Questor