I see nobody cares for the ATOs I asked about lol.
I have tha avast marine deluxe ATO and love it.
Tunze ato is a very nice unit. There is nothing wrong with the two units you mentioned. Having run both. I highly recommend the autotopoff.com setup. It's what I've been running for over 3 years with no issues. If you had $150 to blow on a ato, go for the Tunze. Otherwise the autotopoff unit with the backup sensor and snail guard is the way to go in my opinion.
I've also heard good things about the Avast. Seems to be popular with the Neptune/Apex crowd.....