In my honest opinion, a single person ought to avoid single moms or single dads. Reasoning is simple: you are their option b or c, which translates into your authority being put into question repeatedly, especially by the kid(s).
Think of it this way: for the single dad to end up as a single dad he probably had a shitty wife to begin with (which creates baaaad habits that are carried on to other relationship,) or she passed away. To end up as a single mon she probably tried nailing his ass to the ground with a child (the old good girl/bad boy adage) or she is a fucking pain to deal with altogether.
Either way, not the ideal start to a relationship. Unless you're just looking for pussy/dick miles, which you will most likely get. Now, if YOU think the kid doesn't come with the pussy/dick, you got another thing coming.