9mm TACCOM(1st) vs Blitzkreig 5015HD(2nd) - TACCOM3G.COM

WWW.TACCOM3G.COM ULW-B upper, std bolt. KE Arms polymer lower (carbine length recoil system only). We compared the TACCOM adjustable 9mm recoil system and the blitzkreig HD 9mm buffer…..both used the same 7.5# recoil spring and we used the response cushion (wave spring and spacer) on both systems. The 1st 20 rounds is TACCOM, the 2nd twenty is blitzkreig. SuperVel 100gr pcc blitz ammo was the ammo used for this comparison……which one seemed better?