TYG01 (4x), TYG02 (8x) and TYG03 (16x) are Taiyo Yuden DVD-R media, while YUDEN000 T01 (4x), YUDEN000 T02 (8x) and YUDEN000 T03 (16x) are DVD+R. Which format works better for you depends on your burner. With the right burner, TYG0x DVD-R discs can have the same excellent results as YUDEN000 T0x discs. Here is an example of an excellent TYG02 scan: click.
It's just a matter of time until the slower TY media is phased out. Just like TYG01 and YUDEN000 T01 4x discs today, TYG02 and YUDEN000 T02 8x media will be hard to find soon. Some major european suppliers of TY media don't have YUDEN000 T02s listed anymore already, for example.
TYG03 and YUDEN000 T03 are still new. Once the firmware of the current drives matures, I'm pretty confident that the results will be excellent as well, as one can expect from TY. The german magazine c't tested both media, and especially those new TYG03s did really great in the climatic stability and mechanical quality test.
Yesterday, I've ordered some TYG03 and YUDEN000 T03 discs for testing purposes myself. Looking forward to see how well they work with my BenQ DW1650.