What's better, fat free, sugar free or none?

I'm desperately trying to lose the 20 lbs. that I've packed on after my hysterectomy. I gave up soft drinks and beer, started exercising although I never sit down because I have 4 small children that keep me busy with school, soccer and dance. I also work on call. The only thing left to give up is my morning coffee. I drink decaf with International Delight fat free french vanilla. Is this okay or should I be using sugar free or should I be ditching the coffee creamer all together.? The only habit I have picked up since my hysterectomy was cappuccino which I finally gave up. I use to drink 2-3 straight cappacino's a day and then I started adding coffee to them until I'm now on 3/4 coffee, 1/4 cappuccino but most of the time I make coffee at home and use the creamer.