hosting multiple sites under same account, should I use subdomains?

I use Yahoo web hosting for various blogs that I have, reason being cheap and easy to use. I have roughly 10 blogs under the same account. My question is would it be better for me to have each blog as a folder example name.extension/blog1, etc or should I use subdomains example blog1.name.extension?

if you are serious about the blogs and they are unrelated you should spend some money and put each on their own domain..if they are related topics then folders would be fine i guess