Call me biased..., as I am a bit close to the business of Jackson Kayak... but I would highly consider the fact that EJ designed both boats. The EZ is a great river runner but was designed in 99.
The Fun series however is SUPER comfy, a great river runner and has more design features focused on new school types of tricks. It is also a very, very light boat...
Depending on where you are... there are retailers that have demo's on hand.
check out the retailers at www.jacksonkayak.com