Well, I chose wordpress because I was familiar with it and liked it better than blogger. I also didn't have a tumblr until a couple weeks ago. haha I think it's really just a matter of preference. Some people even have WP or blogger AND a simblr that they post different things sims and legacy related. The people that I interact with a lot on WP I met through a thread here in the forums. I read a story or two, started commenting on their blogs and talked to them in the thread. We became friends and everyone there is super nice and willing to read everyone else's stories. This is the
LINK for the thread if you want to check it out. I totally understand not wanting to migrate all of your work. Such a pain. I don't think you need to either. I'm sure people would love to read it on tumblr. Hope that helps! >_<