I just realized that a T tail is different from the traditional tail (which i guess is an upside down T), which is what I was originally thinking about. I have a design in mind that I want to work on.. at least after I get some more flight experience. and wanted to start doing some research to prep for my design.
For us mere mortals, I don’t think there is any significant difference between a T tail & the traditional inverted T.
If you are using 1,000’s of gallons of jet fuel, a T tail can put the horizontal stabilizer in cleaner, less turbulent air. This makes it more effective, therefore it can be slightly smaller & reducing drag.