If you were to happen to follow instructions of two bosses which boss's instruction do you follow?

its damn easy respect both and try to solve the problem before you take it to them & always be humble and take a stand if necessary  in interest of the organization

Just find the pros and cons of both the bosses instruction, And final conslusion based on the Feasibility and data put infront of both the bosses.

I follow the instruction I feel it is in the interest of the company and discuss it with both