Sony only has one artist with huge sales, and that's Ken Hirai.
Orange Range, Mika Nakashima , YUI & Hajime Chitose have had some success at some point, but Ayu probably sold more with Secret than those artists did combined with their latest albums ....
Avex can be considered as one of the biggest independent labels of the world, despite of people talking trash about them, Avex is still the best label to be in in the j-pop scene
