The problem with the table that shows how bad silicone is for containing CO2, is that it doesn't make it obvious that even the worst of the materials is still very good for containing CO2. Once a tubing type is good enough for our needs it makes no difference if another type is better - both are very good. I use whatever tubing I have or can get cheaply. Vinyl works fine, but does harden in time. Silicone works fine, but eventually hardens. "CO2 tubing" is hardest to use because it is so thick and rigid it takes effort to force it over a hose barb, and even more effort to remove it, but it probably lasts the longest without getting too hard.