Consider someone who has never played a Paradox game before and you have to sell them on either playing CK2 or CK3, I want to know the pros and cons of each and why you would play CK2 over CK3 or vice versa. I want as many details as possible, since if I get involved with either I just know it's going to be dozens of hours spend playing, not counting the time it's going to take to acclimate to either game.
Oh, and another thing, which one is more complete/fun without any DLC? I know CK3 was pretty barebones at launch and CK2 is free right now, so I am guessing the latter wins.