I like the idea of having Ant come off the bench and show other teams how he can be dominant in that role against at least some of the opposition's second string. I like just getting Scoot the reps at the starting PG spot. Obviously @Phatguysrule has the correct answer which is to trade Ant. I also would be surprised if Chauncey doesn't start both... pleasantly surprised but still it would shock me. If Scoot runs the offense efficiently by the time Shaedon is back then we might possibly see Ant off the bench.
Easy answer, start Scoot. We want as much information as we can get, as fast as possible to evaluate the roster, right? Everyone already knows exactly what Simons is currently, and he's basically at his ceiling. With Scoot, there's still questions. Start Scoot.