(1) or (2)?
(1) the heaven of promoting products is the tri-win between manufacturers, sellers and costomers.
(2) the smartest approach of pushing sales is based on win-win cooperations among the manufacturer, marketing channels and customers.
Also, please improve them.
I'm not sure about these.
The ideal product promotion is where manufacturers, sellers and customers all gain.
I'm afraid I'm not very good at this sort of writing, but it might serve as a start.