I played Planetside 2 when it first launched but haven't touched it since. I downloaded Planetside Arena recently but could never get past a black screen when starting the client so I uninstalled it.
I played both for a time. I have Player Studio items in both, as well as all the games they have ever offered Player Studio for (EQ,EQ2,PS2,FreeRealms).
Planetside 2 is a good game and the planetside franchise is different from other shooters where its got its own tiny niche market just like Everquest. It can be an ok solo game it does really shine if you're playing with a large group of friends though.