Just to start things off, these skis are both COMPLETELY different.
I've got EP's and they are super fun, great for low angle pow skiing, pillows, trees, buttering around and just super playful type of riding....I got mine for cheap so I'm gonna keep em and ride em out until I can afford some JJ's but the EP's will still stick around for playful types of riding. Anything serious, steep, sketchy I wouldn't want to be stuck with EP's haha.
I would recommend the JJ's though, I've demoed them and they are an amazing ski. On groomers they can carve great, on chop they cut thru and still ski great and in pow they are down right epic. They are super versatile and can literally do everything amazingly. They have a very nice flex which is forgiving enough for washed landings but stuff enough to charge on all types of snow. You can go with a park ski and the JJ's w/ dukes or barons if your tour or some solid bindings and thats literally a perfect 2 ski quiver...They will kill it from hardpack, to 4 inches of pow and up to 3ft of blower...You just really can't go wrong with them, and if you ever decide to sell you will get a big chunk of cash back.
If you just want a fun playful ski and you ski mostly low angle trees, pillows, jibs, and stuff like that the EP's will kill it...and really if your a good skier you can kill it anywhere with any fucking ski haha...I don't mind riding mine on groomers and in the park either...carving off the lip and doing big 1s,3s and 5s is super fun. My homie with JJ's rides them everywhere...from steep lines to rails and they seem to kill it as well, it all depends on what YOU like doing.
Video of JJ's KILLING IT:
A week in Paradise! from ben Moxham on Vimeo./static/images/flash_video_placeholder.pngCourtesy of 
Newschoolers.com/static/images/flash_video_placeholder.png