We have chosen based on many things. Similar parenting, an actual love for our children, age/health, locality and the means to look after them. DH was still quite set on his mother being guardian for ages, but has at least gone with my suggestion as long as we give MIL first right of refusal.

Seeing as MIL is aging and been ill in the past 2 years, I am hoping she has the sense to refuse direct guardianship, but chooses to stay involved as Grandma. It is not only her health I have an issue with, but her parenting and she is a major technophobe. I could see the poor kids having to go through highschool with no computers or Internet, as MIL would not see the need I would much rather her just stay as Grandma and not become parent.