Daycare

My son is about to start daycare in August but I have a dilemma. We are trying to decide between two places. One of them we know the provider very well but she always stays full. She has a spot opening up for our son but I just found out I'm pregnant so I don't really want to repeat the process all of again come March. The other daycare we don't know the provider, she just moved to town but there is a better chance she will have an opening for our little nugget that is on the way. Thoughts?