I have no experience with Blogger, but I have used Wordpress (though not extensively as Lilias). From a coding/aesthetic perspective, you have a lot of options: most themes will allow you to supply your own header, and a fair number of them are simple enough that you either don't need one, or the most important part of that (your title/subtitle) are text, and are not dependent on the image. You can't customize CSS unless you're a paying subscriber, but I've found that with the wide number of custom layouts you can use, you have a lot to work with.
I also like that you can remove and choose which widgets and menus you want to have on your blog. Everything from links, to tag clouds, to calendars, to syncing with your social media accounts (Twitter, etc.). Really great way to customize your blog without CSS.
I will also echo Lilias' positive review of tracking visitors. I don't generate a lot of traffic for my blog, which doesn't have much of a thematic focus, but it's still fun to see what people look at. :)