[tentcamper]

I would get the cassette toilet.

We had the thetford cassette toilet in our last camper and loved it. To empty you open the outside access door. Pull out the cassette, which by design is sealed when it's removed and will not leak. You take it to any public toilet and dump it. It would hold about 4 day of use for the 2 of use if we used it all the time. Since we mainly used it at night it would hold about 10 days of use.

I don't mine the re-circulating, but would prefer the cassette for ease of use, not needing to wait at a dump station, and being able to simply dump at my house.