3 vs 4 jaw lathe chucks

from http://www.mini-lathe.com/Mini_lathe/Chucks/4_jaw/4-Jaw.htm#4-Jaw%20Chucks :

Benefits of a 3-jaw:


 * 1) self-centering
 * 2) can hold hex bar-stock
 * 3) quick and easy to use.

Disadvantages of a 3-jaw:


 * 1) can't hold square bar-stock
 * 2) run-out/off-center can't be easily fixed
 * 3) can't hold irregularly shaped work
 * 4) can't turn off-center

Advantages of a 4-jaw:


 * 1) work can be centered to high precision
 * 2) can handle square/rectangular bar
 * 3) can turn work off-center
 * 4) slightly more grip on round stock

Disadvantages of a 4-jaw:


 * 1) slower/fiddlier to mount work (dial-indicator required)
 * 2) can't hold hex-stock