The premier line is strong asymmetrics, the master line is symmetric. The first two Pradigms (original and Passion) used the EOX coverstock (which was supposedly more expensive, hence the price premium), starting with the Domination they went to Reactor and R2S like the rest of the Storm line.
Is one better or worse than the other? No. Maybe you match up with the strong asyms, maybe you prefer the rolly symmetrics. Different cores for different ball motions and lane conditions.
SH