OLL55 (I shape)

(R U2′ R2) (U’ R U’ R’) U2′ (F R F’) (vertical I shape)

(F U’ R2) D (R’ U2 R) D’ (R2 U F’) (horizontal I shape)

I use both of these, although the first one is a little easy for me because for the second one I need to use my ring finger to turn the last U, in which sometimes it is caught.