Someone's probably misguided you.
Gree has no T3 models. These models you have shared are a little inferior and cheaper models of FITH series.
Best most powerful and efficient models are 1/2/3 series models that have bigger outdoor unit and these are usually only available at Gree outlets. Also these are expensive compared to rest of the series 4/5/6/7.
Visit any Gree outlet and read the catalog.