With rear sway bar you should gain some steering. but unstable in rough sections
Without rear sway well more rear roll, may have a slower reaction when steering and should have less steering but more rear traction.
Best bet is to try them out, if no one at your local track is running them there moght be a good reason for it.
Tater salad the stories behind nick names how it stuck at that track is beyond me, good times, short lived, forever missed FHR.