My opinion isn't worth much as I've only run T63 front/rear on this bike, but I am happy with them. I've experimented with different dual sport touring tires on my heavier bikes and one thing I pay attention to is how much the tires follow grooves and especially tar snakes. T63 on this little bike seems fine in that respect - could be better but could be worse. There are always comprimises.
I think I'll run T63 for commuting and off-road, and if I do a trip to Argentina on this bike I'll run something like Michelin Anakee for north america, and back to T63 or TKC80 for central/south america.
Current: '91 DR350s mondo enduro commuter!
Past: V-Strom'd to Alaska & Mexico