Does toilet trapway size matter?

[Jadnashua]

Regardless of the small or full flush...the bowl can only hold enough such that the lower flush will fully evacuate the total volume with a dual-flush toilet...you then have two choices...deeper, but narrower spot, or wider but shallower. The best designs get around some of that with the super smooth glaze they use on the toilet making it harder for stuff to stick, or how the bowl is washed, and the best ones use both techniques.

 

[Natslie]

Its a problem for all (that I know of) dual flush toilets. In order to satisfy the lower flush requirement, they have a smaller water spot.

Do TOTO toilets that don’t offer dual flush have a higher water level, or a wide water surface?