Taking material off the tip, or trailing edge will move the balance problem from mechanical to aerodynamic, which both is not good.
Trailing edge correction can be done if the blades differ in width. Leading edge correction is bad yu-yu for above mentioned reason.
If the blades are the same in shape, then the options are either to thin the heavy blade, or apply extra thin coats of paint to the light blade. Rub in between when using spar varnish. For best balance, the prop should stop in any position on the balancer, without any bias towards one particular side.