3 link vs 4 link

[ssonic]

i have searched the archives and cant really find the answers to my questions so im forced to make another thread.
what are some of the advatages of each. im talking straight on performance. so having a hump in my rear seat does not matter in the case of the 3 link. has anyone experienced both? i am looking at either the DSE quadra link or the Lateral Dynamics kit but i cant find out which out performs the other. how simple is installation on either? it is so hard to find an honest answer so can you guys please help me out?