Amerie has never had a platinum album, she barely touched gold on all of them
Here's the reality...
Amerie dropped in 2002, barley went gold, and had the highest charting song only reach #23 on the billboard hot 100
Beyoncé dropped in 2003, went 4x platinum, had 2 #1 hits, a song that was #3 and a song that reached #4 on the billboard hot 100. (4 songs in the top 5)
Since people keep using Rich Harrison as the deciding factor I'll mention that her other #1 hit was produced by Scott storch, in fact storch also produced that #3 and #4
It's safe to say that the competition between them that people speak of actually never existed