I attended the 5 day CME resources conference for my first recert about 6 years ago, and then attended the 3 day recert course in Feb of this year. I felt the 5 day had me better prepared but by the 5th day of sitting 9-10 hours and trying to absorb all this info that I hadn't seen or practiced for many years, I don't know how much I retained by those last couple of days. I took the exam ~3wks later and passed.
The 3 day course was better suited for me this year w/kids, work, etc. Going into the 3 day course I had high hopes that it would teach me all I needed to know and that I'd only have to study minimally leading up to the exam. What I can say at this point is that the 3 day did help prepare me, but it was a very very quick overview of everything. I appreciated having the binder of lectures, all of which were better organized/laid out than 6 years prior. And it was helpful to hear everything and have the speakers point out things that we should definitely know, and provide vignettes about patients w/certain illnesses to help remember those things. I still had to study on my own a considerable amount.
All in all, 3 or 5 day course was worth it. I took the exam about 3 weeks after the course and just found out that I passed (yay!!!). I also signed up for rosh review a month prior to the exam, which I feel was integral to my passing the exam.
BTW my coworker went to the certified medical educators and she felt it was really helpful as well. But she had never been to CME resources so unfortunately I can't compare the two directly. Good luck in deciding!