Try to find servo which will give you smooth operation and really fast response = really expensive or shite.
All, okay i'm currently building my own Vulcan Camera ship Now gimbals are interesting and are crazy options for control boards but what I am lacking to understand is why no one is using Helicopter Gyros for the stabilisation ? I mean one gyro on tilt a csm 720 gyro with a Dam good servo should hold and then another on the other axis again it should hold... main challenges though I suspect is finding servos the right size for the job and the fine tweaks but gyros like the CSM ones you can tinker inside there settings. They can hold a 90 size helicopter tail in a cross wind steady as... so why not hold a camera gimbal steady ? or am I missing something which is very likely...