M.W.
Hi T., I know this is definately a hard question to ask. I too have been thinking about what to do with my 3 year old (we plan on sending him to pre-school this september for 2 days). I believe that he will be just fine, they teach new things each year and if he's going to 2 different schools that may make a difference too. My niece went to preschool and pre-K at the same school and just loved it! I also believe that this may help with building friendships and social-abilities. I hope this helps.
M.