Ball drivers are great when there is something in the way of holding the wrench straight.
Non-ball drivers are often essential when inserting a screw, since the ball driver lets the screw flop around and not go into the threaded hole straight. Highly aggravating.
I keep both styles on hand whenever building a thing that has a lot of Allen-head screws.
The Wiha 263 series of hex screwdrivers are indispensable - I have a set everywhere that I work on stuff.
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