Clowney's game isn't Reggie White like. If you're just talking best pass rusher, then fine, but Reggie was more than a pass rusher.
At 6'5 291, he could have played DT, especially since his era was before most o-linemen were 300+ pounds. Even in today's NFL, he could play DT in a tampa 2 scheme.
The two closest guys would be Julius Peppers and Mario Williams, but neither have the power and strength Reggie had and even though both are legitimate pro-bowl players, they are literally half the player Reggie White was.
Greatest Plank Ever!