And? This doesn´t mean anything. Because we don´t know how many of each were printed and sold.
Well firstly, it is only my opinion I am by no means stating it as a fact, but secondly while it is true that there has been no publicly available, systematic examination of point of sale data, there are still quite a few facts or at least accepted truths out there.
We know from an anonymous Wizard's source that in 1990s there was a real slump, with 6-8 new books* each year selling mostly between 7,000 and 15,000 units, though they varied a bit on either side, depending on the brand and big sellers did still exist, such as the 1992 Forgotten Realms campaign books, that had a print run of 175,000. (As an aside, Average Books for 1980's are listed at 50k to 150k and the 00's at 30k to 60k.) [*figures exclude the core books.]
Now we do not have any real concrete figures for White Wolf, but there print runs would have to be ludicrously low by 80's standards to not be beating that, which the creation of ArtHaus really belays because you do not create a sub-division to create low print run book lines if all you create is low run book lines.
Now at the time admittedly WW claimed to only be number two, but I don't think anyone really realised just how bad the 90s were for TSR, if you look at their big sellers like that Forgotten Realms book and the Players Guide then sales looked healthy, the issue was there was little beside that.
As we are unlikely to ever know for sure, the real question is do you think it is feasible White Wolf sold so many books that they ever overcame AD&D sales, I think in the 90-95 period (after 95 WW sales also slumped massively,) its feasable, YMMV.