No. The "t" version is newer and better because it's easier to understand and because it supports enabling/disabling Online-HyperTuning.
Also, the "t" version has two checkboxes for hyper tuning
(enable online hyper tuning AND force hyper tuning).
I understand that "force hyper tuning" always forces the drive
to use HT even for known media.
The official (non-t) version only has one button to enable Hyper Tuning.
What does this mean ? If I enable it in this version, will it be "always
forced" or will it be only used when needed ?
The "Disable HyperTuning" button in the non-t version only changes HyperTuning and not Online-HyperTuning. It's equivalent to the "Force HyperTuning" checkbox in the "t" version, except that the checkbox is for enabling and the button is for disabling... that's why the "t" version is easier to understand.
HyperTuning is always enabled for unknown media.
So use the "t" version - it's newer, easier to understand, and more powerful.
EDIT: People have different experiences with HyperTuning and Online-HyperTuning. On my 5S and 6S drives I usually have both turned on and that wotrks at least as well as with any of the options turned off. OHT should in theory be good when you have variable media because it checks the media while burning and can modify writing strategy on the fly. HT should in theory be good when you have unknown media and known media with batch variations, because it can modify write strategy for the current disc.