One vs Two piece toilet

The one piece are pretty good looking, but I never owned one. I've heard so many complaints about them that I'd not buy one. Maybe new ones are better though.

I've recently installed a couple of Kohler 1.6 gallon comfort height units. They work well every time and stay clean.

The one piece units that do not have power assist are at a disadvantage because the drop height of water is less. That said, there are some excellent ones. We bought two from Costco about a year ago that work great. Went back a few months ago for a third. They switched brands and the latest one doesn't work quite as well.

I'd make sure your toilet is rated for 1000g from the full MAP report:

If it were me, I would stick with the two piece toilets.

That's because single piece toilets often require special parts that are only available from the manufacturer; like the toilet trip lever, for example. You might have to pay $40 for a trip lever from Crane or Kohler, whereas a $3 plastic Master Plumber trip lever from Home Depot will fit on their two piece toilets.

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About height:

This applies to toilets of all formats.

If you have a rent house, and the renters are, ummmm full figured, probably more like morbidly obese, and they think the crapper is some kind of lazy boy recliner... a one piece toilet might be just the thing for them.