The FFVI T edition rom hack is the original game with a proper translation, higher difficulty and additional content like tavern quests, new weapons, etc. It also contains some quality of life improvements (sprint shoes no longer need to be equipped, for example) and corrects some calculations. For reference I made it about 60 hours and still have much to do. My only gripe was that battles were stuck on force wait, so you had to wait for things to execute before your ATB gauge would refill. That may or may not have changed as the patch has been updated a bit since I experienced it.

If you're up for the challenge I'd recommend it. As I understand it, the pixel remaster, although interesting looking, lacks some of the bonus content added to other versions of the game. This has that, and much more. It felt polished to me. I thoroughly enjoyed it. Hope this helps