Been using a EZ bar (Olympic style) for the up-right's. No special reason, just changed from a straight bar. Find less stress, either narrow, medium or a wider grip, on the wrist/forearms. Still do Hi-Pulls on a regular Olympic bar though. Better rotation for the hands/grip. Guess you could do heavier bent over rows with an E, also. bar.
Using a EZ bar, for some, when doing heavier curls, also gives less stress on the wrist/forearms. The flex of the wrist seems to give the most problems with some guy's, bothering the tendons, joints, etc. Tricep exercises can work well with an EZ bar, if pain in the wrist/forearm area. Good Luck.