With all due respect in reading the PSUSA home page you will see numerous grammatical and spelling errors. This is not the type of attention to detail that inspires any confidence. The folks running the site are obviously not the sharpest tools in the shed. I have to question if they have any idea how the strings they promote really play? If they did, they would know the Premier Ace plays softer than the Big Ace.
That said, Premier Ace is made in Taiwan while Big Ace is made in Germany. They come from different factories. At the same time the site refers to them as siblings. Yah...whatever. Bottom line is if you play with one set of each you will find, and I GUARANTEE, that the Premiere Ace is the more comfortable and softer playing of the two.
Stan has spoken. Stan only speaks the truth.