There are two different types of tubing in the conversation here... NB has both Silicon and Thermoplastic, Austin has silicon.
The link I posted was for the thermoplastic.
I bought a bit of both to see which I preferred. Thermoplastic is stiffer and you cannot see through it at all. Silicon is flexible and a little bit translucent. The only downside I can think of to the silicon it that for me, sometimes it is too flexible. If you have a fairly long hose coming from a horizontal connection, the weight of the fluid tends to cause the hose to bend and kink at the connection.
After some hands on with both, I have been buying the thermoplastic as I need more hose.
Ed