I had a blogspot before and found it kind of annoying to update, which made me update less frequently and not as motivated to update. I just recently starting working hard on my tumblr and got it looking pretty much like any other blog and I am SO much happier with tumblr. It is so much easier to update and get followers, so I completely switched over and only use tumblr now.
For my non tumblr followers, I added a subscription for email updates, I have a contact button on the side of the page, and I added comments. So all of the things that a blogspot or wordpress would have, but with the added ease of tumblr. :) But, it really depends on what you need out of a blog.
Here is my tumblr if you're interested -
http://www.favillephotoblog.comIf you're interested in any of the ad-ons that I have, let me know, and I will give you the website that I got it from!