What to do???

My big question of the day is, Headstart or Pre-k. I'm really trying to decide what would be the best option for Alex. Pre-k is more academic so the teachers would expect a lot more out of him. A couple of his therapists have suggested putting Alex in Headstart this year and pre-k next year and then starting him in Kindergarten a year late. I'm just not sure what to do? Anyone have any suggestions?