I think San Diego Comic-Con is the best. It's huge, has tons of famous guests, and offers a wide range of activities and exclusive merch.
For me, New York Comic Con takes the cake. It combines big-name panels with a diverse range of exhibitors and cosplay. Plus, the location is amazing. But it really depends on your personal interests and what you're looking for in a comic con.
I'd say Emerald City Comic Con is the best. It has a great atmosphere, attracts top comic creators, and there's always something new and exciting to discover. However, different people might have different opinions based on their preferences for size, content, and accessibility.