Doing a Sentry Gun Project, Need Some Advice on Servos

Hmm ok cool. Is easier interfacing the only advantage of a servo motor controller? Does using one improve the performance (ie positional accuracy) of the servos in anyway? I'm only going to be using two servos, one for each axis of rotation. I'm pretty new to this stuff so I would appreciate it if people here can answer some of the questions I've posted up top.