While studying for my JNCIA-EX certification, I compiled this short cheat-sheet. While the EX-series of switches run JUNOS, there are additional features found on the EX-series than on other (J-series, M-series, etc.) platforms.
The EX-series seems to offer a healthy set of features, especially for a hardware series that hasn’t been around for many years (as the Cisco Catalyst line has been). True, Cisco does (and probably always will) hold the richest feature set, however the EX-series is definitely worth examining.