I always preferred live. Hanging with other tax geeks was fun, and some questions people asked really helped figuring out things you hadn't put your finger on to ask. Since I moved to VA, however, live seminars are so far away that they would require overnight stays or hours on the road. I've adapted to online and find I get a lot out of virtual seminars if I keep taking notes and stay focused.
I dropped my membership in NAEA this year, after almost 20 years. Seminars were way too far away, the online blog was sometimes informative but filled with posters just trying to be the smartest person in the room, and I realized that all I got out of my membership was a quarterly journal. The state chapter fees increased this year, and I decided that paying $365 for nothing but a journal wasn't worth it. In CT, at least I got to go to live seminars and network. They were expensive though, as NAEA spends a lot of its funds on lobbying and doesn't grant much to the state chapters to offset the cost of seminars. NATP seminars were more reasonable in price, but often they were a little too basic for me. I have retained my NATP membership.