I just went through a very similar dilemma with three interviews for one spot! I thought I wanted the older child who fit in really well with my group, but the mother presented some red flags (tried to negotiate the contract etc) and then the family of one of the one year olds was totally wonderful and very enthusiastic and gave me a very good feeling. I also had thought I didn't want to take on another baby, but I decided to go with the parents I liked best as I feel that is the most important thing...plus it is easier to get a little one into your routine, to like your food etc. Fingers crossed I made the right choice; I feel really good about it, so I think it'll be good. Good luck with your choice! I'd go with the parents you feel you would have the best working relationship with.