Most of the rear blocks out there are more or less equivalent in how they function and their hardware. However, ReadyLift and Pro Comp's blocks are actually cast iron with an E-coat finish, so if you live in an area with heavy salt use, the Halo Lifts billet aluminum blocks may be a better choice. The Halo Lifts blocks are also tapered to help keep near-stock pinion angles, though they do lack integrated bump stops. That being said, vibration issues are fairly rare (especially on 145" wheelbase trucks with a one-piece driveshaft) with any rear block option.