What's the best for my blogging needs?

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Wordpress all the way. Check out these guys for your themes. They cost $39 and you can download any themes you like. Here is a review http://www.theme-magazine.com/elegant-th...ss-review/
Best of all. They have Tumblr styled themes so you can use Wordpress and make it look like Tumblr.
A quick tip!! After you install the theme download the Elegant builder plugin (its free) and use it to create your content. It makes everything really simple and fast so you can just focus on doing what you do best, creating content.
Wordpress gives you much better ownership of your site and if you host your own, you are pretty much running your own business and you can make the choice to earn money once you have a following. Most of all once you are running wordpress you can add plugins to do anything you like. So much more flexibility, easy to use if you get the right theme. Try these guys because the support is amazing and you can ask noob questions and they give you fast, real solutions. Also they have an awesome database of questions asked. Go wordpress for sure, spend a small amount of money for a professional well supported theme http://www.theme-magazine.com/elegant-th...ss-review/ and run a professional blog you can build into a real business when your ready without having to loose all your backlinks or loosing your existing followers. Plus you can tie in social media in a flash. No brainer, wordpress with a professional theme all the way