Which is better, WordPress or Blogger? The short answer is, neither, or both, depending on what you are trying to do with your blog and your level of expertise. After reading quite a few articles, I will summarize, with a caveat that I don't quite agree, what the theme seems to be: WordPress for serious business and Blogger for beginners or casual Bloggers.
That said, obviously you are reading this on a Blogger blog. I started with Blogger in 2006 and I am a huge fan. I think there is value to using Blogger and I like the service. The ability to customize is excellent, although knowing your HTML is helpful when customizing Blogger.
If you want to do your own research, here is a list of excellent articles reviewing the two: