The Bilsteins and Monroes are both gas charged, which means they have initial resistance to any small bump and that bump is transmitted back through the frame and steering wheel to you.
The Koni FSD are not gas charged and they absorb the small road joints and other bumps and do a great job of preventing proposing and excessive body roll.
For really large bumps they all work about the same. I took my nearly new Bilsteins off of my coach and GAVE them away so that I could install the Koni shocks. That was probably 60,000 miles ago and they are still doing their job.
If you don't use your coach very often, it may not be worth it to you. If you put 15-20,000 miles a year on your rig, like I do, it was well worth the investment in my comfort.