Let’s look into the major weapons of each.

The Red Bull X2014 has a downforce-generating fan to keep it going flat-out in almost any corner.

The McLaren MP4-X is has electrodes for active aero control, plasma generation, and a ground effect underbody.

The Renault RS2027 has a more basic active aero system, but also has active suspension, as well as 4WD.

Ferrari’s concept, however...I dunno. It wasn’t like they were totally serious about cutting-edge technology for this, not like the other three.