That depends on several things:
If you're going to perform on a stage with spotlights? The T5's tilt screen is superior there; you *can* get a cardboard "screen shield" for the Genos that makes it useable (otherwise the Genos non-tilt screen gets completely washed out).
On the other hand, if you want to put samples in your keyboard (Middle Eastern, Chinese, Indian, etc) the Genos offers 3GB of usable sample space; the T5 you either have to purchased a 512mb, 1Gb or 2Gb expansion card (if they're even still available).
The Genos has superior Piano, Strings, and drums; all future styles will be designed for the Genos drums, they will mostly work on the T5 with a ton of tweaking (fortunately Jorgen has made Revo drum software to do the heavy lifting). The choirs are identical; I believe the organs are as well. So if all you care about is choir or organ, get the T5. With one caveat: the Genos allows live drawbars on all 9 footages; T5 can only handle 8 and you have to keep switching between the 2 lowest.
If piano is *really* important to you, then the Genos piano is much, much clearer (when played through the same monitors, but additionally the Genos 2.1 speaker set is much clearer than the TRSMS05 speaker that the T5 is compatible with).
If you want to really add a lot of sounds; the Genos is the superior choice; even if you find a memory expansion card for the T5, certain sounds just won't load in the T5. For example, while the Indian drums will, none of the instrument voices will.
Finally, the paint *can* rub off the Tyros (yes i've seen it) but it takes very little to make the Genos' case rub from matte to semigloss (particularly around the high touch areas like the volume knob and joystick) and the only way to fix that would be a coat of clear matte (or mask off text and spray matte black, which is a whole other world of pain in the ***).
Oh also the Genos is nearly 10lbs lighter than the T5-76. In fact, it's even lighter than the 61 key Tyroses (Tyrii?)
Mark