Session-wise, I'd have to say that the two events are very similar. The one exception being that CEC is attended by folks from product engineering. Many of the sessions have these folks as presenters. This allows the session to become a deeper dive if the attendees take it in that direction. One of the presenters from the most recent CEC mentioned that they were asked to keep the content at a high level. My guess is that the organizers requested this because many people use these events to get some cross training. I have nothing against that, and I applaud the individuals efforts to expand their “toolkit”, but I think what we've ended up with is a scenario similar to returning to school only to find that only freshman level courses are offered.
So session-wise, I'd have to say that CEC beats out IW, just because of the engineering presence.
Networking is a HUGE benefit of these types of events. With the broader audience attending CEC, I usually ended up eating breakfast with folks from other countries(like Jersey!). The IW attendees are a more targeted group. It is much easier to find software folks to “swap war stories” with at IW, and being on the Sun Federal side of the house, those contacts can potentially be used in my day to day job. It was interesting to meet some Sun folks from far away lands but due to the nature of the federal space, those contacts aren't terribly beneficial.
So, networking-wise, I would personally have to say IW win's out. I realize for the non-SunFed parts of Sun, it would probably be CEC though.
As for location, CEC tends to be held in fancier places. I've been twice, once to San Francisco, and this last time to Las Vegas. For the past few years, IW has been held at the Qcenter, which is out in the boonies West of Chicago. Its a nice facility for this type of event. There are no distractions, so there is nothing to do but learn. An added benefit here is the individual rooms and the fact that you don't have a roommate. When attending CEC, you have to have a room mate(or you can pay for half the room), and the locations tend to offer many distractions.
So location-wise, I think the facility where IW has been held is a nicer place for events like these. That said, this past CEC had 4000 attendees, which I don't think the Qcenter could facilitate. So the location battle, I would have to call a draw.
