I would tend to favor the 5C. There are likely oodles of special deals for collet sets for 5C chucks.
I recently bought a manually operated 5C collet chuck from Yuasa. This chuck is relatively inexpensive, but you provide your own backplate and mount it. The advantage of the Yuasa chuck is the "dead-length" feature. This means that the collet does not shift endwise when tightened up. This is important if you want to do accurate, repetitive work that requires control of the Z axis (spindle axis) component.
The only bad feature of this chuck, is the fact that they use a male end square drive on the collet closer cam. This square end projects out of the side of the chuck and represents a safety concern: it could snag your sleeve or give your hand an awful thump if you are working near it in manual operations.
A person could machine a safety ring to mount on the body of the chuck to act as a guard for this square ended actuator.
Compare this chuck at about $400 US to other dead length chucks for $1200 or more. Thanks goes to WMS for pointing me in the right direction on this chuck.
First you get good, then you get fast. Then grouchiness sets in.
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)