The double cyclone has more bowl wash and that gets rid of the skid marks.
All of those toilets flush in a range where clogging sould be non-existant for most people excluding those that have medical abnormalities.
The noise on any of them should not be a factor.
The one piece is primarily a matter of taste and cleaning.
The sanigloss finish is super smooth and helps in keeping things clean.
The eco models while having lower capacity in some cases is not really a problem. In some conditions with a older home and a badly leaking sewer line less water per flush can be a problem.
You are on track and primarily its down to do you want the Soiree for its increased bowl wash?