Liveaboard toilet options

[Trmundinger]

Good day all,
A newby question...
We are preparing to move on to a 40 ft Bayliner and are considering toilet options. Both heads are in need of updating and or replacing, and I'm looking for some impute on which is best for 2 adults.

Option 1. Stick with the manual pump toilets. Our tanks need replacing as well.
Option 2. Electric flush, with a black water treatment system. Expensive, but looks like low maintenance.
Option 3. Composting toilet. More affordable, green, and the ability to close off a couple of thruhulls is appealing.

We would love your thoughts