Why not take the money you would spend on soy and buy some real food. Like beef. It has a superior amino acid profile and ZINC which you may be deficient in. Good luck.
I plan on eating both, but was interested supplementing a small portion (about 1/4 to 1/3) of my daily protein needs. Soy protein seems to be the least expensive and very affordable. It would be 1,555 grams of protein for $24.
Soy protein is cheap because its awful. Its also not a particularly good choice for males. Its a phyto-estrogen. Just do some research. Beef, chicken, fish, and eggs are great and supplement with whey or a whey egg protein blend. All of those give more bang for the buck than soy and taste better.
protein is protein just like a calorie is a calorie no matter it's source correct?
No. Aside from the poor amino acid profile, soy contains trypsin inhibitors which block protein degrading enzymes. If you don;t fully digest protein, you don't absorb it. There was a study a while back that showed eating soy even lowers the bioavailability of other protein sources you consume with it because they don't get broken down.