What’s right for your blog depends on (a) what your audience wants and (b) what you’re comfortable creating.
If you’re a freelance writer, your blog articles should serve as a showcase for your writing.
If you’re a public speaker, most if not all of your blog posts might be embedded videos (i.e., a vlog, or video blog). Post your videos on YouTube, Vimeo, Wistia, etc. Then embed the videos in your posts. (Ideally you would include text transcripts.)
If you have a podcast, embed postcast episodes. (Again, ideally you would include text transcripts.)
If you ask me, publishing high-quality articles with regularity/frequency is more important than format.