Agree with Stu 100%. Except that the Compact II fits my boat better, and it is also a very good system. Raritan heads are made/distrubuted here in NJ-- home of the early Hunters as well.
The best part about the PH series is that one can be bought as manual and retrofitted to electric in place; or it can be bought as electric and either de-fitted to manual or, if the pump or battery ever fails, can be used as manual with minor or no modifications. It's got to be the most versatile basic head out there.
I just came into ownership of a used Wilcox Head-Mate which made me retire my 'Frankentoilet' (a mismash of unrelated parts) in its favor. The Head-Mate is a good, basic head with many decades of solid history. Thetford make them now-- I cannot vouch for the newer ones. But both the old-school Raritan series and the Wilcox ones were high-quality units when they were made, parts are still available, they can be had for cheap used and are easy to rebuild/repair.
Having worked for WM ('big blue') I should also add that I am quite sure the reason WM sells so many PAR/Jabsco 'Twist-N-Lock' heads is not due to their quality (which in my experience is not their best-selling feature) but due to the increased discount WM gets from PAR/Jabsco to stock and sell them. Just because they're plentiful doesn't make them better. You will notice WM do not stock much in the way of Raritan nor even Thetford. But both of these (I say, superior) heads can be had through sources other than WM if you only look for them; and you may well get a better deal anyway.
So... I say go with what makes you happy.