Honestly? I think the best is an installation of Wordpress hosted on your own domain. Why? Because that way you have total control over the look (instead of having to choose from a limited set of pre-installed themes). You have total control over the functionality (instead of having to stick to a pre-installed set of widgets). You have total control over the content (instead of having to abide by somebody else's Terms of Service). You don't have to worry about Blogger or Wordpress.com coming along and disabling your account because they decided your blog wasn't something they wanted on their service. (Check the terms of service. They both reserve the right to disable accounts and/or delete blogs without notice, for any reason.)
And, best of all, it's all under your control. Because it's on your own domain, if you later decide to switch to another blog platform, you can do so without having to start from scratch building subscribers and links.
If for whatever reason hosting your blog yourself isn't an option, I don't know that anybody else can tell you between Blogger and Wordpress which would be better for YOU.
They can only give you their opinion of which one they like better for THEM. Keep in mind, what's important to them
may or may not be what's important to YOU. What's easy for them
to use may or may not be easy for YOU.
Both are fine platforms. Both offer advantages and disadvantages. Both offer free accounts, so set up an account with each, try them out, see which one YOU like better -- that is, which one better meets your needs.