Janet had two 90s releases, with both of them doing about 10-13 mil each.
Madame Dion and Moo were doing 30M+ eras.
Whitney her total is a bit shady and inflated due to the Bodyguard, but the janet. era sold comparable to IYBT. And TVR era sold comparable to MLIYL.
So, really The Bodyguard soundtrack is a bit of a tiebreaker between the two (and also more memorable, anyway).
.janet sold 20M and TVR sold 10M. And being a force has more to do with sales, Janet gave us innovative records in the 90s. The others you mentioned in your post didn't.
I don't see the video doing much for it outside the States where it will get a decent boost next week because of the streaming rule. Hopefully it gets even one week in the top 10.
Mariah outsold Madonna in the 90's and we all know how their careers turned out, Katy can get all the hits she wants but at the end Gaga will have more impact and would have established herself as a touring act like Madodo.
You guys try so hard to make Mariah look like Cyndi when:
A. She's sold well over 20M albums, like Madge, since 2001/02
B. She had one of the biggest eras of her career, 15 years into it.
C. She's had multiple top 10's, like Madge, since 2001/02 + #1's.
D. She had her biggest first week in 2008.
E. She's still a respected, influential vocalist and will continue to be that for another 24 years.
She's still making millions of dollars for doing practically nothing, people of this generation still use her music, her recurrent airplay is on point. If Mariah's career ended in 2001, then I could understand your logic, but as it is anyone would be happy to have a career similar to what she's had. It would actually make more sense to use Whitney or Janet as an example as they both came out in the 80s. Using G0D as an example works only when it comes to touring.