There are a zillion blogs out there, and it may seem like your own, little independent blog will just get lost.
So, the allure of writing for another site, perhaps for someone else perhaps more established than you, may seem to be the best way to go.
It isn't. Unless they are paying you well for your work, don't, I repeat don't, write for someone else's site/blog. If you want to maintain your own voice, and have full control over your own content, create your own.
The worst thing any blogger can do is to go write for another site, for no/minimal pay, and with no clear agreement over who controls the blog.