Blog or Website?

After spending time learning to use Google Sites and now Blogger I have a question. Are these tools redundant?  As far as I can see, Blogger is the superior format because of the ability to communicate with your audience through comments. Can anyone find a good reason to use both Sites and Blogger?

Below is my Google Sites content for this week's assignment presented in Blog format. 

Hindu Kush Earthquake 2015

On October 26 a magnitude 7.5 earthquake struck the border region between Pakistan and Afghanistan. This is a very seismically active region, as the Indian-Australian Plate is converging with the Eurasian Plate, forcing up the Himalayan Mountains. As of October 30, there have been 390 fatalities, compared to a similar sized earthquake (7.6) in the region in 2005 which resulted in over 85,000 deaths. Why the disparity in casualties? Follow this link to find out why:Hindu Kush Earthquake 2015