I didn't have both of them but I know some guys running them.
Imho both are great and superior to the Federal, at least the AD08 is better.
Jake/Danish had the R1-R. Shure he'll visit this thread.
The choices are toyo R1R £161 each or yoko advan AD08 about £140 each
If the Yokos are even cheaper I'd go for them!
Both great, think I'd chose the Yoko myself. Lotus boys love them. Look at Federal 595 RSRs too
I know some guys very lucky with the AD08 running on the Ring. Sadly the AD08
isn't available in Germany and has to be purchased in the UK or Poland.
I'm not completely satisfied with the 595 RS-R, Tony. While it feels more stable
and grippy on dry than a R-S2 I had some issues with cracks/crazes on the tread.
It's also very poor on the wet (esp. when cold). So not suitable on a daily driver.
ps
If you have 8x18 wheel with ET48 - ET51 think about going for 235/30 wide tyrers.