What about the King shocks put it ahead? Build quality, capability, feature? They both look like high quality large body shocks with RR.
I know the Kings are available with RR and adjusters, but I thought the adjusters only controlled compression. Not sure if it's an internal bypass shock?
I do like the BP-51 features... independent adjustments for compression and rebound seem nice for tuning a Overland style build where you would be dealing with loading up the truck with a lot of weight. I see more tuning to be had with the OME.
I like the King shocks better if you are into speed or are a desert person, which I am... but it seems like the only way to get a bypass shock is to get a secondary in something like a LT setup. At that point, yes, id consider the King pair to be miles ahead in both capability and adjustability.
But apples to apples, 1to1 with RR, id like to see a more detailed comparison... I doubt it would be night and day, I think it might come down to application and tune.