If you're serious about blogging, DO NOT use a hosted blog. Spend the money for hosting and use something like wordpress to have your blog on your own domain. If your site grows at all and you start to monetize, you'll want your own domain!
Nice advice - Thank you / Anyway the interesting key issue is why ! => you do whatever you want with your own solution, that's OK => you get better results with Google with your own solution ? If yes, that's super/mega OK ! This is the key issue
As far as search engine results, I recommend blogger blogs. You can do some minor tweaking with it, but I've always gotten better results with blogger than wordpress blogs. It's kind of ironic because one guy who disagreed with me once had a wordpress blog that he talked all about a few particular keyword phrases ... funny thing is that with one post on that topic, I had much better results than him for it. If you constantly add content to it, you'll get rewarded -- regardless of what blog you go with, though. Brian