Among the advantages of Zoomblogs over Blogger:
- the availability of categories (so that you can navigate the content on a blog by theme, not just by chronological order)
- the choice of 3 different levels of expertise
- it uses terms anyone can understand — "blog address" rather than the technical "URL", for example
- the "editor" (the bit where you write) is slightly more user-friendly than on Blogger (except for images, see below)
- you can make a back-up copy of your blog
- the fact that it is not owned by Google-is-Evil
Advantages of Blogger over Zoomblog:
- if you are going to be uploading a lot of images (and images undoubtedly make a blog more interesting), Blogger is easier to use
- the Blogger "help" file is much better — indeed there is no FAQs or single help file on Zoomblog (though each section has minimal help), a huge oversight
- Blogger offers you a "delete format" button which is handy when your paste text from somewhere else and it looks "wrong" (because you also pasted in the format, font type etc)
- Blogger is bigger and better maintained; in 4 years it's never given me a serious problem — in 4 weeks Zoomblogs has, and there are several blog service providers that have temporarily, at least, stopped service
- Blogger also gives you better privacy, if that's important to you
Which should you choose?
I'd suggest Blogger if you want to include lots of images and want something really robust, Zoomblog if categories are important to you (which is why I shifted this blog from Blogger).
Another good free option is a blog at edublogs.org, also very easy to set up and giving you the option of setting up a wiki, too, besides also being a service for teachers. There is also eslblogs.org, specifically for ESL students.
Just out is a blogging service from Yahoo (still in its trial version). It's dead easy to use, but very limited in what it offers you if personalising your look (etc) is important to you. You want something really simple? This might be what you're after!
The professional alternative (not for the beginner!) is Word Press and they now provide a (limited) free service, which I can recommend. You get categories and the possibility of (new) "pages" (not just always posting on the same one) but virtually no possibility of editing the appearance of your blog — unless you go for the professional one. You can also import a blog from Blogger, complete with comments!