What in your opinion are the advantages Biden has over Sanders (or Sanders has over Biden) ?
No way the Democratic Party will let Bernie be the nomination. It was no coincidence that when Sanders started to pull away from the pack the more moderates drop out and endorse Biden.
Full disclosure. I am a Republican. But I think the Democratic Party did Bernie dirty last go around. I will have to say that I respect Bernie in that he has had the same message for over 40 years. He does not change his message based on his audience or who he is talking to.
Biden is more relatable to the average Joe. Pun intended.
To be fair, in other places and times, the Marxist dialectic has been exactly what related to the average Joe. Soviet Russia late 19th century to early 20th century. As an example.