Swan Song vs. Alas, Babylon? Which Apocalyptic Classic Should I Read Next?

So I'm looking for a good apocalyptic book to read.

Can't decide between Swan Song by Robert R. McCammon or Alas, Babylon by Pat Frank.

My favorite Apocalyptic book is prob The Stand, close seconds would be maybe I Am Legend, The Postman.

Someone help an indecisive person make a decision. Or if you have another better book I should read, I'm willing to take recommendations. I'll link my Goodreads so you can see what I have read.