I use spring steel hose clamps like these:
https://www.dhgate.com/product/motor...404217759.html
They come in many sizes, and each size will work with a variety of tubing sizes. They're cheap, and reusable. A downside is that pliers are required to install and remove them.
For tubing short runs, I haven't found it making much of a difference between material types. Silicone, Tygon, and cheap imitations all work. On longer runs the tubing affects instrument dynamics. The more tubing is elastic, or the longer it is, the more it will delay and slow down the responses.
Size is a little more difficult to chose. If the probe orifice is large, a bigger diameter tube will transmit changes faster. If the orifice is small, the capacity/volume of the tube will form a filter against the source resulting in delayed and slowed indications of change indicating use of a narrower tube.

-Wit, HZ