Hey brother, always glad to help. When you say "mix products", I think you are referring to things like Geneza's Andromix, which containing 50mg each of prop, tren and mast. I think they can be great, if they provide the doses you are after. The main drawback is, you still may want to have more of each drug in individual bottles, so that you can getting your doses adjusted, if needed. Lets say for instance, you want to lower prop but increase mast and tren. You won't me able to make that adjustment if you have everything mixed into one vial. Toward the end of a prep, I usually like to increase my masteron, so I might end up getting an extra vial, so that I can get the increase I want. Think ahead as to how you might want to manipulate dosing and then get the extra gear you may need individually bottled, while using the mix as your base to build from. 

About the Winstrol. if you can, you would be better off using it at 50mg ED instead of 100mg EOD, regardless of it being injectable or oral.