My first chuck was a 4 jaw. I thought "It's more useful - it'll hold
anything." True enough, but the diddling around with 4 adjustments
every time got tiresome. Especially since 95% or more times it's round
stock that I'm turning. I now have a 3 jaw also & I wouldn't be without
it. I.e., I'd give up the 4 jaw 1st.

BTW, they are both Bisons & the 3-jaw centers to .001, IIRC.

Bob