What are your thoughts on the different types of preschools?

I’m looking at preschools for my son and I’m really overwhelmed by them. I hear so much about how great Montessori schools are, but it seems a little weird to me… then again, I really don’t know what I’m doing. What about religious run schools? Are they super indoctrinating? What are the good and the bad experiences you’ve had with schools you’re familiar with?