Tis all about the Brakes. That is the one area where F1 cars are unmatched and
clearly miles ahead. While an LMP won't go as fast around a corner, it also weighs 2/3rds of another F1 car more.
Open Wheel racing and top speed do not belong in the same sentence. Same with Aerodynamic efficiency. Bet you a dollar a customer LMP is more efficient than even the most efficient F1 car.
Speaking of Sportscars and F1, was there not a time when the Porsche Group C cars were
faster than F1 cars?
Le Mans is a circuit that had not one, but
two chicanes add in because the straight was too long to be "safe", yet the cars still routinely hit 200 MPH in between. It's a fast circuit in every sense of the word. Only thing I could think of for F1 is Monza. LMPs are not faster, it's that their one large race is on a circuit that is faster. A/LMS/Sports Car racing in general is all about Le Mans. It's a fair comment.
Plus most sports car series don't have these gimmicky tires that last 15 laps max. lol