You can do a search on this topic for more info but digital holds better in all positions but most sport pilots wouldn't notice the difference. Depending on the plane and how you fly analogs serve just fine. I use them both and often mix servos for different controls. For most planes 60 size and under analogs are a good choice so you can save your money but I still like digitals on my rudder and elevator. 60 size planes I use the cheaper Hitecs digitals. Not needed but I like them.