The question by itself is flawed!
It has been answered a gazillion times! Insulin is THE most anabolic hormone in the body. Now some of you do not realize that anabolic means that it will lead to muscle tissue and adipose tissue growth alike.
Testosterone on the other hand is androgenic anabolic. Basically, it has androgenic sides(hair loss, acne etc) but it leads to increase of muscle mass and decrease of fat mass.
I hope you see the difference and understand my point that the question is flawed.
Most of all, I hope you do a bit more research and understand some ELEMENTARY concepts!