From a blogger's perspective:
Wordpress is a little more flexible, both in terms of customizing and theming, and also from an administrative perspective, since you can easily integrate Wordpress on an existing site or host a Wordpress blog from your own server. However, it's a little more involved. I would go with Blogger (aka blogspot) (now owned by Google); it's really simple, intuitive, and easy to use.
But for my money, the best blogging platform is the one I authored both as a fun project and also as a tool I could use to put a blog on my personal website
From a reader's perspective:
The platform does not matter as much as 1) the quality of content and 2) a good theme (selection of fonts, colors, etc.) that makes reading easy!