Which blogging platform do you use and why?

I havent tried the other you mentioned but i use Blogger. Reasons why i use it: a).You can access your account with your gmail login and password. b.) you can have many blogs with different addresses but under one single account. c) you can blog while one the road with their mobile blog feature. d) you can send your blogs to be publish via email if you choose. e) they have pretty decent templates to choose from and u can also customize your template if you like.

It depends on which blog you're talking about. For me, I have a couple. For my graphic sites, for updates, I have my server configured to use Wordpress. For my actual online journal, I use Livejournal which is a product of SixApart, so I use that one. For my "making money" blog, I use blogger, just because it seems to be the "popular", "I trust it" site around here. Out of all of them, however, I tend to favor my Wordpress format, except for the fact that I have a hard time coding layouts to work with it.