I chose the flex tubing because it was cheaper and easy. I did not want to take the time to cut PVC for 2 reasons. 1) I did not have time 2) I did not trust myself to cut it in the right lengths. It also seemed so much easier to throw some elbows on the tubing than have to cut everything to nearly perfect length. I do not have to worry about my cuts being a little too long because it bends as needed. I also liked that it was just .30 a foot from Rich. I can always just throw 30 ft of flex tubing in an empty tub in the rack whereas 30 ft of PVC might not be as easy to conceal. Go with what works for you and weigh the pros and cons of each.