The ester is only there to dictate how quickly the steroid is metabolized in your system. You liver will strip the ester off the steroid to activate it. Longer esters typically take longer to remove.
Acetate is the shortest ester there is; therefore, you would have to inject frequently, like every day. Results will come faster, but you will also lose those few gains you'll lose during PCT quicker as well.
Enanthate is a long ester so you'll only have to inject 2-3 times per week. Gains come more slowly, and excess gains will disappear more slowly.