Well, my oldest son (5) has been seen by a behavior specialist who has suggested that he may have Asperger's. He, too, is in preschool right now, and loves it, but only because he has a teacher who is extremely sensitive to his needs, and who is very nurturing.
We decided to homeschool because of this. He learns academics quickly, but seems to have immense trouble learning the social rules that are so important in a formal school setting. We spent a lot of time touring schools and researching, and finally decided that if we went with the traditional school, we would have to struggle every year picking just the right teacher, and, even then, with 20+ students, a perfect teacher would not be able to give him the attention he needs. We also saw children like him being picked on, and teachers punishing them for not paying attention, or not being able to sit still for 20-40 minutes at a time (for kindergarten).
This is just not what we wanted for our son, so we chose to homeschool.
I have been told that if he is diagnosed, we could legally force the school to provide one-on-one attention for him, but, in reading the experiences of others who have tried, schools resist that (because they do not have the resources) and it can become a huge battle.
Honestly, I didn't want to go through that, nor did I want to put my son through that in his formative years. We did not want his self esteem and academic learning to suffer for his lack of social skill, and felt that his social learning would be better served by planned social activities where I could help him learn, as opposed to throwing him into a class with lots of kids he had no idea how to handle, and a teacher who is really too busy to help him, however much she/he may want to.
I hope this helps. Good luck, no matter what you decide.
Homeschooling mom of 2 rambunctious, loving, spectacular boys, wife to an incredible man who has been my best friend on this journey <3