Remodelling a bathroom near a kitchen (public space) and would like the quietest unit possible.
Also going for a modern design, so a wall hung, tank in-wall unit would be an advantage - also easy to clean floor. Also using wall hung vanity for similar reasons.
The walls are 2x6 construction (even interior - the toilet is against a LB wall) so plenty of room for an in-wall tank.

So if I go conventional, I am thinking about the Ultramax. In-wall, the aquia.

Any thoughts on which would be quieter, better flushing, etc.? Other considerations?