This is a good question. My opinion is this, any suspension on a dragster will help. I have an older slipjoint that works well, but there are extreme circumstances where my newer car would help. It's a triple SJ, 4-link/Xlink. I think the newer swing arms will work as well, just a little easier to tune initially. Get which ever is cheaper, swing arm or 4-link if you are looking, either is fine. Both also offer a smoother ride down the track.