Which Engine Temperature Alarm? Watch Dog or Gardian ???

Ok everyone, a question for Saturday night.. I'm looking at engine temp alarm. Two units stand out as being what would be acceptable for my Patrol, one being the Australian made Engine watchdog and the Engine Guardian from the U.S. The Watchdog has an engine sensor and a low oil pressure output and the Guardian has several other features like other user outputs, start up and bump up features, and I have to say, it looks a little nicer in the aesthetics department. So who has used one of these two units and who considered both before making a choice and who is happy with their choice and why.. I have a home grown low water alarm which works well so I'm really just interested in the thermocouple style, block temperature monitoring. Thank you in anticipation. Michael