Toto did some rebranding last year. Pointless. They had been calling CEFIONTECT CeFIoNtECt (or whatever stupid capitalization they use) everywhere else in the world except the US. Obviously, the smart person at Toto who decided that they needed a less-stupid name in the US for their nanotechnology finish no longer works there. They had an actual well-known brand with CEFIONTECT. Now they have a dopey name with snark-inviting capitalization that I still can't stop mocking. It's the same thing. Works well. Not a panacea but works well.
Tornado and Double-cyclone. Same thing. Maybe they thought that we don't have cyclones in the US like they do in Asia, so went with Tornado to make it more "local". (They obviously overlooked the fact that one of the oldest and most famous rollercoasters in the US is the Cyclone at Coney Island, where their marketing people have probably never been.) Like I said, it's all marketing, something the Japanese have a history of screwing-up in the US. Remember Datsun? A solid, well-known brand in the US, associated with power and speed, because of the Z-car. "Datsun. We are driven." Thirty-five years since they stopped using Datsun in the US, and I still remember the freakin' slogan. But Nissan decided they wanted a "global brand strategy", so they changed the name to Nissan. They still haven't recovered in the US, and Toyota continues to smoke them.
But I digress. As to the 1G flush vs. the 1.28gpf flush, it's not even close. Get the 1.28. It's not so much about flushing ability as it is about water spot size and bowl wash. If you are somewhere in a drought area and really want to do your part, then the 1G is great. The people that get the 1G in California, for example, love them, and they get high reviews. But the people who get them and love them are willing to accept a tradeoff in water spot and bowl wash for the good feeling they get from using 25 percent less water per flush. In other words, they love them because they are amazed at how well they work on only a gallon of water, not because they work as well as the 1.28. From 1.6 to 1.28, Toto managed to do it without any really-noticeable tradeoff. From 1.28 to 1.0, the tradeoff is noticeable. It works great, but the 1.28 works better. cst454cEfg, not cUfg, is what you want.