I use tumblr which I find easy to use and easier to connect with other simmers via their Simblrs and to post content, legacy or not.
I have a legacy by 'tagging' my posts with the legacy name and then creating a page which shows all of the tagged posts in the order they were written, or from the latest update.
For example, if the legacy was called the Smith legacy, the url would be:
'wildeatheartx.tumblr.com/tagged/smith-legacy' if I wanted to show my legacy from the latest update.
If I were to add /chrono to the end it would show it in chronological order.
You can easily add in these pages by using the customise feature on tumblr. It is also an easier way to have multiple legacies at once as you can just use tags. Furthermore, if a sim dies you can link to a page with all of the posts they were tagged in.
It sounds complicated but it's really easy once you start you will get the hang of it.
You can see my tumblr
here if you want an example.
Hope this helps you make an informed decision!
P.S I used to use blogger but found it very unreliable in terms of how many people view your blog because there are many of them which are bogus and it is possible for a virus to get into your computer. I wouldn't recommend it.(also dont mind my avatar or any spelling errors i havent been on a computer for about a week)