Well I think it would be nice to hit the canal roads or back roads going to town or something along those lines. Have more of a Dual Sport bike without all that heavy weight. I'm not sure the Supermoto would be all that useful for me. Besides a 250 with super moto isn't that almost a moped?It all depends on the intended use. If you are mainly going for road performance (Super Moto) then sticky street bike tires are the way to go. If you want dirt performance then DOT dirt tires are the way to go. For example I have a Pirelli MT43 DOT trials tire out back and a DOT Pirelli knobby up front. I take it real easy on the pavement with this combo. My setup works really well for me off road.
You can get tires in a whole range of dirt vs street. It all depends on what you are trying to do.