Without naming names...Not all pitot tube covers are created equal.
As a bare minimum look for one that's bright, UV stable/Fade resistant, a good tight fit, and with at least a 1 year guarantee.
Since red is basically black in low light some pilots prefer the florescent orange/reflective lime green ones that make them more difficult to miss during pre-flight. Some pilots prefer the blow off type which is about twice the price of others.
BOOT STYLE: If using a boot style cover for angled type pitot you want at least 1.5sq inches of hook/loop closure or risk having your pitot cover turn into FOD on a windy day.
PITOT PLUG: if you prefer a pitot plug, compare the thickness, useable length and max working temp of the PVC or whatever plastic the manufacturer uses for the plug. Check for a hole half way down the plug that allows air to be vented from the plug as it's slid on. (ie. you don't want to rapidly pressurize the pitot static system) If you happen to fly in a climate that becomes very cold, a fabric boot style will likely be a better choice.
PIPER BLADE: 3 or more types to consider here. The pinch and insert (round, then forms around the blade) type is ok if you're in a warmer climate, but again here the cold can make this type less desirable for some. Another option is the black/red flag one that's already formed into the blade shape. This one, like the first type, really has to be jammed on to stay in place through gusty winds. Not good for the majority of Pipers with blade pitot tube not mounted to a rib. Lastly there's a bright fabric /florescent Blade Pitot Cover that uses a rubberised trim/pull cord and hook/loop to grip the tube, which appears to get the best online user reviews....
I hope that helps you prudently select your next pitot cover!
Product Manager - Redfab Inc.