SaaS targeted to team or one user

What pro and con building SaaS which targeted to team? And what pro and con building SaaS targeted to one user?

I have an idea for SaaS which targeted for team, but I never work with team, and I know I will never use my software till I have a team.

I also have an idea for SaaS which targeted to one user, but I don't know what the pro and con for that.