In my opinion a good beginning dose of deca is 200-250mg per week. Also, dianobol and nandrolone decanoate are two completely different things, it isn't something that can be compared in a way to determine which is more effective. Deca is used to lubricate the joints, protect against injury from weight lifting, as well as giving a test cycle a little extra anabolic strength. Dianobol is a very fast acting and powerful testosterone, to be vague. It offers strength and muscle mass gains very quickly, but can also be quite toxic in the liver. If you know anything about Anadrol, Dbol is very similar. Have you read any of the steroid profiles on this site? They're a favorite of mine for referencing the properties of each individual steroid.