Wordpress is also very good. It is easy, clear in their instructions and like blogspot, you can have followers. The area to find those blogs you follow is much simpler on Wordpress. They also allow you to have snow on your screen during December!
Weebly, I am afraid is not one of my favorites. I do not like how you have to pimp your blog on social media to allow for followers. Totally sucks. It is fairly easy to use, though, and the help is very good.
Tumblr is ok. I think it is so easy I found it hard to use. It is also more for people who use social media a lot. You can tweet or FB or whatever else you do with making connections there. I think this is why I found it so difficult to use. I don't social media my blogs, so it isn't as efficient. I was amused to see how one post can be sent out on EVERY kind of media possible and everyone can follow it as it moves. Talk about leaving a cyber footprint. If you want to be slightly incognito, stay away from Tumblr! On the other hand, their directions are fun to read.
It is interesting to see how different places measure up to someone who really doesn't do much with technology. If Granny wants to start a blog, go Wordpress or Blogspot. If your twenty something kid is interested, go Tumblr. Weebly is more for businesses, I know our library uses Weebly.