In reply to Sophie.

Album sales may not be an indication of who is the better performer (like you said none of the Spice Girls have produced a solo career nearly as successful as Beyonce's or even Kelly's). However, greater albums can indicate that a group has a LARGER FAN BASE. Depending on the Album/sales ratio, if Spice Girls sold more copies per album, this would prove that they had a larger fan base than Destiny's Child, therefore, they would sell out a better tour than DC. I like DC way more than Spice girls, but I think Spice Girls do have more fans, especially internationally. Just being honest.