I have never done a direct comparison between the Pearls and Perspectives. But I currently own JA Perspective2 speakers. Last year, or perhaps the year before, I went to listen to the Pearls at a local seller's house. The guy was ready to sell them at almost half the retail. I absolutely loved the sound but big boss said no!
My Perspective2's are in a 15x20 room with 12 ft ceilings, and produce a very healthy amount of bass. In fact, some times it seems to get a little too much. I'm adding thicker bass traps and additional paneling for this reason. If the new Pearls have similar bass signature, I suspect the bass might get too much for a 13x18x9 room. They are much bigger when compared side by side with the Perspectives.
The Perspectives fill my room with music and satisfying bass, and honestly, not once have I wished that the sound was bigger or fuller. It's amazing how a speaker with a sleek and relatively small cabinets can produce such a big and immense soundscape.
IMO, as great as the Pearls are, Perspectives are a better fit given the size of your room.
P.S. You didn't mention whether you're looking at the latest version (Perspective2 Graphene) or the older version. I've never heard the older version but from what I understand the new version goes much lower in the frequency range.