I useWhat's the best 4x4 Nb perm alg?

R' U R' F R F' R U' R' F' U F R U R' U' R

But the inverse

R' U R U' R' F' U' F R U R' F R' F' R U' R

seems more popular.

You may want to check CubeSkills (OLL, PLL), in addition to Speed Cube Database (look for the votes under the "Big Cubes" column).