Creatine IS the cheaper of the two choices. However, it will not help you pack on much muscle. Most of the "
weight gain" is in fact water being retained more in your muscles. Also, if you are taking your creatine with grape juice or, it is a very high carbohydrate combined creatine supplement such as Muscle Tech's "Cell Tech" (around 75 grams of simple carbs per serving), the
weight gain you see is probably FAT gain. Creatine buffs...the guys who are the hard core users that swear by the stuff....as well as the companies (Like Muscle Tech or ProLab) strongly advocate that you take your creatine with a high carbohydrate beverage. WHY? Because the high dose of carbs taken at the time of creatine consumption (Muscle Tech sez their "research" indicates you need at least 75 mg of carbs) is supposed to cause an 'insulin spike' and this in turn, is supposed to help your system absorb the creatine ("dump it" into your system is usually the term they use) more effectively.
All this of course creates problems for people looking to add muscle mass and at the same time lose body fat. It becomes an uphill battle. Not to mention the fact that if you have diabetes or a family history of it, you better not be messing with your insulin levels like this.
Whey protien is the better choice but usually more expensive. If you need to add 150+ grams of protien to your daily protien intake to gain the muscle mass you need, ...that's a lot of protien shakes. At least 3 shakes a day even with milk (mmm bovine hormones....mmm...hope you dont have a family history of cancers too). Youre also looking at making a pretty drastic (for most people anyway) dietary change. Shopping for food at the grocery store becomes a hunt for protien rich foods. Milk, eggs, meats, seafood, especially TUNA. From what I recall TUNA is about the best and least expensive source of concentrated protien. VERY CLEAN source too. Meaning theres nothing extra in the tuna. Something like 25-30 grams of protien in one .60 cent can of tuna.
So I guess the best bet is to analyze your budget and see how high of a protien intake you can afford LOL. I remember when I was working out more in the Marines and would read "Muscle Mag" or similar pubs. I would read about these body builders who supposedly consumed 300 or 400+ grams of protien a day. I was like, damn how the hell they afford that, their growth hormones or steroids and living....oh wait, they have corporate sponsors!:bottumsup