Trust your own ears.
I have heard the Salon 2 many times but never the Studio 2. Keep in mind the “2” is much better than the original. Anyway I think the Salon 2 is without flaw. Spending major money can get you more resolution through better parts (crossovers, cabinet) but you are well into diminishing returns.
Harman had the A3 and Salon 3 in their blind AB testing and the V8 Revel own… done by revel… so take it for what it is but I am sure you can find the article.
The 328be is a pretty amazing speaker too and not just for the money.