My first Model A, 1960's, had hydraulic brakes off a later Ford. They worked great. The main advantage of juice brakes is even braking on all 4 wheels. While an original brake system on a Model A will work great, it takes some adjusting to get the 4 brakes to pull an equal share.
I put the Flathead Ted system on my car and like them, but the brakes have to be in good shape before hand. The Flathead Ted system is not a bandaid.
I see some of the parts houses have hydraulic conversion kits for stock brakes. I have not tried these nor know of any results.
The Flathead Ted system lets the shoes float which does two things. It allows application of braking force to both shoes while a stock brake system puts more force on one of the pair. It also self actuates the brakes, meaning that the motion of the drums adds to the braking force.