I've been trying to be more aware of edge control for last-pair F2L inserts, and definitely understand sledgehammer vs. R U R' for certain cases. But I'm struggling with understanding the advantage of U2 R U2 R' over U R U’ R’. Given that both are two-gen on R and U, I'm having trouble finding instances where one will produce more solved edges than the other. I do see that they influence which edges are solved, but not the number.
Am I missing something? When would you use U2 R U2 R' instead of U R U’ R’?
Thanks.