What sold me on the 885's is do I really NEED the ability to adjust height down to the exact turn of spanner? No. I bought a bunch of top plate spacers and played with it until I got the height where I wanted it and "close enough" driver to passenger for about half the price. Sold off the spacers I didn't use (actually only ended up needing 1/4" on the driver side only).
As far as rates go, I don't know the difference between the two you have here, probably won't make much of a difference. I can only tell you that I went for the 885's due to their length over my previous FJ coils. With the 5100's set at 0 notch, the 885's weren't preloaded much, resulting in a comfortable ride and no harsh topping out on full droop. With the FJ coils at 1.75 notch to get almost the same amount of lift they were extremely preloaded and rode like crap.