The powder gets into your system faster which is what you want where as the pills will take time to dissolve.It's also more expensive taking creatine in pill form.Also just to get 5 grams of creatine you'd have to swallow a lot of pills.If you don't like the taste of creatine powder you should try Cell-Tech fruit punch.That stuff tastes amazing & works very good.
Im not sure if im correct or not but takign creatine in the powder form, you can mix it with water and the water helps transfer the creatine faster and more affective. I have used CELL-Tech and i had huge gains.