Mandy Moore, by far. I had no idea how badly she flopped until I looked at her stats. Ashanti's reign may have not been that long, but she was big.
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So Real debuted at number 71 on the Billboard 200, selling 30,000 copies in its first week of release. The album eventually continued to climb the chart until peaking at number 31.
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Moore released her second single, "Walk Me Home", the same day as the album. The single failed to match the success of its predecessor, failing to chart on any major charts. It did, however, peak at number 38 on the Top 40 Mainstream chart in the US.
Mandy wasn't as big of a hit as Ashanti was, but, at least, Mandy still remains relevant in acting (voice of Rapunzel on Tangled, her role in Saved!, recurring role on Grey's Anatomy) while Ashanti is really known as Nelly's forever girlfriend at this point...
I say Ashanti. Mandy will always be remembered as the least successful of the four blonde teen queens during the rise of bubblegum pop in the late 90's. I feel like everything Ashanti contributed to music has been completely eclipsed by the more talented Beyoncé.
Ashanti had a larger and more recent success. Mandy was unfortunately a fast casualty of the post-bubblegum, pre-Urban pop landscape and while some of the other girls were able to cross that gap, Mandy never did.