Balls 1000% for me. (I actually have both balls and racks of my own). I find even the cheap $10 plastic racks work great if the balls are new. If the balls are all differnt sizes, even the fancy $150 racks won't work, in my experience.
I actually bought a set of balls and the Delta Elite rack at the same time, and had a special vinyl case made to hold the balls and the rack. I'd leave it in my car all the time, incase I got into a big one pocket game. The whole reason I bought my set is because a tight rack is critical in preventing the corner ball from leaking out in a one pocket break.
Now that I have my home table, I took the ball and rack set out of the car and use it on my table.
Why didn't you just by their super sweet case and balls set up?
http://www.delta-13.com/accessories/Delta-13-case
