I think you're thinking of TCAF for tabling every other year! I actually love that policy (not that I've tabled at TCAF) because it spreads the wealth to the number of creators who want to exhibit.
Fan Expo is an absolutely huge show that's sort of more focused on becoming SDCC North. It had ridiculously awesome guests last year, but the layout of the convention centre is such that they exiled the artist alley and exhibitors from the celebrity going guests (who were in the north building). A lot of people saw a drop in sales from this. Simply put, though, as the attendance is rumoured to be ~140k, there's just no better option for a venue than MTCC! It's craziness, but I love it. I've had the same table for several years now, and there are fans of mine who know exactly where to come to see what new things I have to sell 