single rolling harrow vs double vs packer

I currently have a wing fold packer that I pull behind my soil finisher.  I works ok, but the rolling harrows appear to do a better job leveling.  So, I am thinking about buying one (used), but not sure which is better, single roller or double.  Anyone have experience with either?   I have read that some of the earlier double rollers will eat bearings.

 

Also, my ground is sandy loam, with ROCKS.  Or am I better off staying with my packer?

Thanks,

Kurt

single rolling harrow vs double vs packer