(r U r’) (R U R’ U’) (r U’ r’) (horizontal center line & a colored URB)
(R’ F R U) (R’ U’ F’ R U’) (R’ U2′ R) (horizontal center line & a colored UFL)
The second algorithm is 3 moves more than the first one, so it is not a waist of time to adopt a half turn AUF & the first one in case of upside down. Having said that, I myself prefer using the second one.
If you are good at left hand moves, the following mirror method may be the option.
(l U l’) (L U L’ U’) (l U’ l’)
Exciting Rubik’s cube 