I've seen so many posts about R U R' U' x3, though i prefer to use Joël's algorithm, U2 z F' R U' R' U R' F for that case. I basically use intuituve F2L, although when I tried learning algs for the hard cases, I found that either my intuitive way of solvin the case was the same, took the same number of moves, or was better, although I solve each case the same way each time it occurs, say if the same case occurred twice on the first and 3rd pair, I solve it the same way, except for maybe the angle.