We are full timers and used our Sani-Con exclusively for over 12 years.
We have NEVER had any of the problems that others have posted. Just Lucky I guess.
Water powered units, I have told are banned by some campgrounds due to their excessive use of water.
I will say that we are not obsessive about a 'sparkling clean' black tank that we will get dirty before the day is done.
"is one brand better than others"? Based on my personal experience and extensive daily reading of RV chat boards, I would say YES. SANI-CON.