The best one I have used for soaking up the bumps and jumps is an ez ryde. They are awesome and light. The only drawback is having to run the track so tight.
M-10 are good but heavy unless you throw a lot of money at them.
mountain addiction is the best for boondocking or making your sled more playful bar none. If you want to build a sled for your wife, this suspension is it.The shock on each side makes it roll over easier. The only problem with them is you lose a little weight but not much. They have some rebound issues, wich can be worked out. You catch more air on the second bounce.
Holtz are good but there are better ones out there.
For the price and the weight you lose you can't beat the timbersleds. It is too early too tell how they hold up if you start pounding them.
I have rode a snowhawk and they soak up the bumps better than a sled. That is all I know about them.
Hope this helps.