I've used both the Toto Drake and the American Standard Champion and have to say that I prefer the Toto Drake.
As far as the A/S 10 year warranty goes, it's nice to be optimistic, but I believe it's premature to offer a 10 year on an untried product.
I will say that the Champion I installed for testing has already had the original defective tank replaced.
The first tank leaked water from the tower and the hardware released too soon, not allowing enough water from the tank to clear the bowl.
The new tank works at the moment, but for how long?
I've seen many 50 year roofs replaced within five years and what about those lifetime siding products pulled from the market.
The ADA versions are long, tall and heavy. If you have grab bars installed, check to see if this toilet will fit under them.
On the other hand, the Toto Drake has a very complete flush and moves a lot of waste. 900 grams for the CST744S elongated version. The fill valve and flapper are made by Lavelle Korky in the US.
Repairs to them are easy and can be done quickly without tools.
My pricing can be seen here
When things are working as they should, either of these will do the job.
Drake 800 grams by Veritech Video