Ive installed both and am running the Alloys on my Jeep. I like the clear boots on the Poly's/Synergy. I went alloy cause they were cheaper, heck for a set of four they were less than moogs. Ive only had them in for four months. They were tight as hell when first installed and were pretty freaky to drive as the Jeep wouldnt return to zero on its own. Theyve since broken in and feel fine.