I use the Southwire/TRC hard wired one.. I'd rather have a Progressive Industries HW-50C but due to a rather impressive sale the one I have was about half the price...
Why Hard wired: Outta Sight of sticky fingers out of mind.
You NEVER forget to plug it in
And it works well.. And yes it has already discovered an issue that COULD have caused me problems.. except it shut me down.. I reported it to the park and they found ... A screw loose. They tightened but I've not yet returned to the sight.
I had a portable but .. Well. it suffered from exposure Plus I had to outside to look at the display (The modern ones have a radio remote display) the hard wired has a hard wired display that's on my info/control panel INDOORS.. Kind of nice