Both are actually web pages. 

Both are collections of files that include content to display and directions on how to display it. The main difference is in what they’re used for and how they’re put together. Web pages are more brochure or display –like. They include specific directions on where and how to display specific things.

Blogs are a specialized sort of website intended to make it easier for people with no knowledge of the technology to communicate on the web. They tend to be focused on displaying text and making it easy to post for both the bloggers and for persons wishing to comment.  Web sites take a fair amount of work to set up. Blogs take almost none. And putting new content on a blog is as easy as logging in and typing your message into the box.

A website is generally a more static presence on the web. It’s a display and is important for an author trying to sell books. Blogs are intended to facilitate communication and discussion rather than presentation of anything in particular.

Flat website Pros:

a. More flexibility in layout and design
b. Ability to add more features
c. Generally allows a more professional look and focus
d. Requires less time for upkeep and maintenance

Flat website Cons:

a. Takes more work to change content
b. Not the right choice if you want to do a lot of talking and/or update frequently
c. More expensive

Blog Pros:

a. Can be done for free
b. Easily updated
c. Lots of templates available

Blog Cons:

a. Limited flexibility in layout/design
b. Customizing the template requires considerable technical knowledge of HTML and style sheets
c. Harder to keep it clean and maintain the focus.
d. Less search-engine friendly
e. More time intensive since it needs to be updated frequently to be effective