I had a similar problem deciding either on a tank or dps class originally, and a good friend of mine asked "Do you wanna set 'em up, or put 'em down?"

Then yadda yadda yadda, I'm a SMN :P

Put as other said, do what you feel comfortable with and most of all what YOU enjoy. But I'll agree with sovalou above me in, "this game needs more tanks". Couldn't agree more.