I have had both. I am going back to spring retainers. The reason I am going back is because I now have lockers. Massive amounts of wheel travel becomes a mute point because I can lock the diff and keep momentum going even with a wheel off the ground. I did not like the clanking of the spring re-seeting. Also the shocks had to hold all the unsprung weight, thus making it a failure point. Shocks are not made for this. However, I have not had a shock fail. Also, in some cases, there are advantages of keeping unsprung weight on the ground. So for me, when I was running open diffs, I used cones. Now with lockers, the disadvantages of cones out way the advantages. I know this debate could go on and on because the trail conditions and driving style will add variable that will skew the point both directions.
-Jarrod
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