GGGB, Loud for the general part and right now Unapologetic is at the forefront of the GP's mind, out of all her albums this one has the most popular album tracks that weren't fully pushed as singles like Jump, Pour It Up, Love Song, Numb etc
Loud. Sure GGGB was successful enough to firm place her on the map, but it wasn't until after the Chris Brown incident that she truly became Rihanna the celebrity. Her venture with Rated R wasn't her most successful so her ramped up new image, new sound and flurry of hits to follow with Loud made it it more iconic/memorable to the public.