79 Trans Am: Quadralink vs G-link with the rear frame rail clip

[ramairws601]

Hello, long time lurker here but I finally must post up my problem. sorry for the long post but heres the situation. I have a 79 Trans Am and thought I had it narrowed down to Alston's G-link subframe clip or DSE's quadralink.
I have seen all the various talk on these two systems but never one about the alston frame clip.
The rear frame rails on my car are solid rust free rails but they werent welded at the factory very well. near the bottom of the back seat where the rail should be against the pan there is a gap for about 8 inches and none of the spot welds reached. the first ones that did near the end of that section actually tore the metal out.
SO, I can take all that out and go G-link frame rail clip and solve that whole problem plus have full solid rails. with the DSE I would have to try to close that gap and weld up the factory rails and modify them for their kit. seems like the full rails would be the better option to me. I have a hard time using either DSE or Alstons kits that utilize the stock rear rails. Plus the g link looks simpler with canted uppers instead of panhard rod.
anyone have experience with the G-link subframe clip?
do I really NEED new full box frame rails?