I think this will depend more on the uptake of either console than anything else. Similar hardware sales will presumably show Forza in the lead, but if either console has a significant advantage over the other, so too would the accompanying racing franchise, methinks.

DriveClub should be unusually successful as a new IP, given the advantages that come with being a launch title. Remember the sales of Resistance: Fall of Man, for example.

Sure if it launches with the PS4...
I am personally hoping for a DriveClub bundle and Killzone Shadow Fall bundle.

DriveClub PS4 bundle for europe confirmed

What that mean? I will win my bet

Isn't Drive Club free with every PS4 pre order?

It's free on ps+ and IIRC ps+ is free for a certain amount of time so this will make it "free" for as long as you pay for ps+. But it still is not the same version, the ps+-version lacks parts of the retail-game.

Few tracks and cars... the retail version is the complete game... if you like the free version you will buy the full version.

What that mean? Sony realized that DC will sell bad at retail because of the ps+-version and given it's hard to sell a racing game besides GT. So they bundle it. Or they want you to win the bet :D

Sony bundled almost all launch games for PS3... it's safe to do that to created a initial user base for the console.

But it was bundled already via ps+. This is what I don't understand. 

I can't even understand... the game is not a PS+ game.

Edit - you are talking about the DriveClub Plus Edition... that's not the same game... it is a limited game with few tracks and cars... looks like a Forza game with only Prague and five cars to play.