I would tend to think it is the left hand (drivers side) hub making the noise because in the right hand turns the left hub is moving more. But, unless money is an issue, I would do the left first and then the right because it is going to go next.

1986 Dodge Ramcharger 440 2wd, Bracket Racer Under Construction
1998 Ram 2500 QuadCab, new daily driver.
2008 Honda Element
2014 Carry-On 7x14 Cargo Trailer