I just wanted to say Hi, I have 3 boys. My youngest is 4 and a half and after some work on hubby we are going to try for number 4! I am glad to meet you
My oldest (almost 10) and youngest are very close and do really well with each other, they are all very close

I have heard both, though. I think it depends on the family and personalities you are dealing with.
Anyhow, Good luck with your decision.