I've had more success with the Toto Aquia then the Caroma when it comes to installation and repairs down the road.
I've sold a few hundred of the Aquia with almost no problems, so your guess turns out to be wrong.
The Caroma is also good, just not quite as good.
What the video does not show are the two holes at the back of the bowl for two screws that go into the floor.
Caroma expects that if there is a tile floor, that the installer will bail out and just Silicone it to the floor.
Since you have never installed a toilet, let me assure you, if you Silicone a bowl to the floor, good luck ever getting it off again.
We won't use Silicone for that reason.