I've never played Driveclub so this will be based on the other two. Biggest and most diverse open world? The Crew by a long shot. Most diversity in what to do? Also The Crew. Biggest car selection? The Crew. However it's arcade style driving that's not for everyone. Also actually getting enough money to afford those cars can be a challenge. It's a much better game then people give it credit for but don't expect a realistic driving experience. I love the off-road driving though. Lots of customization options but you can't change any of them. You put a decal on and that's it. You select a color and that's it. No changes. Need for Speed is more realistic and they only have a night mode so far. While The Crew tends to do everything for you, Need for Speed breaks everything down. Front and back tire pressure, handbrake response, fast or slow handling, how much horsepower your car has and all sorts of other stats. It's very cool to look at but could be boring or overwhelming trying to tune overt thing if you want a more laid back experience. Also SO. MUCH. DRIFTING. If you like drifting then Need for Speed is the way to go. Very well done but there is a lot of it. Car selection can feel a bit small but you have greater freedom when it comes to tuning the handling and fine tuning color/decal customization. Both games let you play with friends but I've only actually done it with The Crew which was a lot of fun. I haven't tried playing with friends in Need for Speed. It depends on what kind of experience you're looking for. Both of them are good in their own way but very different from each other. Want something more open ended and laid back where you can just explore for hours! Get The Crew. Want a more realistic experience that focuses more on the cars and driving experience? Get Need for Speed.