It really depends on your personal preference. Not all one piece toilets have a squat tank. The Toto Soiree is a good example, it looks like a regular one piece. Which toilets are you interested in? No matter what you do, get a toilet that performs well. Looks are usually secondary to performance and size.

Good luck!

I'm looking at different Kohler ones, all with Class 5 flushing. I just don't understand why the 1 piece are so much more expensive. Is it because it's a bigger unit to manufacture?

It's more expensive to make a 1 piece.

Sky

we have a one piece, Karot, something like that, was not expensive at all, around a $100, put it in a new half bath we installed. Right quick I'll be replacing it with a new one. its too short, didn't notice seeing it on display, also, off subject but its a side mount handle which has caused me numerous problems adjusting the flap.

Less chance of leakage too.

It is usually far easier to clean a one piece skirted toilet, as it doesn't have a separate tank that attaches. There are plenty of one-piece toilets with standard height tanks. I also recommend getting ADA height toilets, as they are far easier to get up from (particularly as you get older it is a big benefit). The bottom part of a toilet is much easier to clean if it has a smooth skirting, as opposed top those with lots of in and out movement tracing the plumbing. The Toto Soiree and Guinevere are two examples of great flushing units with easy to clean sides, as there are no difficult places to clean on the exterior. These two models also have a cyclonic flush which keeps the underside lip of the toilet far cleaner than standard gravity or power flushes.

Then again, these models are around $500. The Toto Ultramax ADA is also very good (and less expensive than the Soiree, but it has more curves in the area that can be skirted.

Greg