Have a look into the benefits of creatine there is lots of info on the net. It's the most researched supp and has a wealth of positives to your body on and off cycle.

I would say 250mg a week is too low and that one positive of aas whilst in a calorie deficit is that it will protect more of your muscle, although without reducing your cals you could increase your cardio that would cut you up for sure so long as your eating clean.