Denny Hamlin reckons NASCAR's Xfinity Series cars are better than the NextGen cars from a racing standpoint. The Joe Gibbs Racing driver feels it's difficult to pass with the new cars, especially when they are running in traffic.With the advent of the NextGen car, the field has become even for drivers. With the components picked from single-source vendors, each car is almost similar in terms of specifications. But the nature of the NextGen car hampers the one crucial element of NASCAR: its competitive nature.A driver can't pass another car running at the same speed as his own. Reflecting on the same, Denny Hamlin said on his podcast, 'Actions Detrimental' (via Matt Bussa, driver of the #62 car for Kevin Harvick Inc. in the eNASCAR Coca-Cola iRacing Series):"We all know that these NextGen cars are terrible in traffic. They are the worst cars in NASCAR in traffic. When we designed them, we designed a car that is (the) worst that it's ever been in traffic."Denny Hamlin revealed that he has asked the concerned authorities if they are sure about the new car before launching it:"I asked them three times before this car came out, 'Are you sure it's right?' In December, before they launched the car they put it on track with another car and see that 'Oh sh*t, we got a problem' No kidding, you got two years to figure this out. God, it's frustrating as hell."Denny Hamlin is a 54-time race winner in the Cup Series. His array of accolades includes triumphs in the Coca-Cola 600, the Southern 500 and the Daytona 500. He's also a seven-time winner at the Pocono Raceway.Hamlin's most recent win came at 2024 Würth 400 at the Dover Motor Speedway in April. He's fourth in the Cup Series standings, with 706 points.Denny Hamlin praises NASCAR Xfinity Series carsThe Cup Series cars and the Xfinity Series cars might look similar but are not. The differences range from the length of their wheelbases to the magnitude of downforce in the vehicle, but the biggest lies somewhere else.The difference lies in the fact that, unlike a Cup driver, an Xfinity Series driver can manipulate the car in front of him by riding the draft in a calculated manner.The car in the front blocks the uncontrolled movement of air, creating a zone of lower air pressure just at the bumper. The tailing car can make the lead car go loose by disrupting the aerodynamic drag. Speaking of the Xfinity cars, Denny Hamlin said:"They're able to pass. If a good car is able to pass... then, they're able to manipulate the car in front of them instead of getting manipulated by the car in front of them.""That is the big difference," the Cup Series regular added. "(In) Cup, the closer you get to them, your car takes off. You lose all downforce; you're done. The closer you get to the car in front of you in the Xfinity, as soon as you get close to the rear of the car, they start losing rear downforce and then they get off the bottom."It requires years of experience and practice, but that's where the true essence of race craft lies.