Are you going to race the bike, ride it in the dirt, or are you after a look?
On my Ascot, I have dual-sport type Shinko Trailmaster tires. The rear is a 130-80-18, with an E 700 tread pattern. The front is a 110-80-19, with an E 705 pattern. I would have preferred the more aggressive E 700 for the front, but the size wasn't available rated for tubeless use.