Short answer: it depends. I used to attend Anime Expo every year but it got so big that lines became unbearable. Most interesting panels tend to be overcrowded so good luck getting in unless you want to sacrifice time for other things and get in line really early. The vendors can be cool where you can find some unique and hard to find merch but it takes a lot of walking past booths that have a lot of the same things. That said, the bigger festivals have the most interesting things to see and do just know going in you won’t be able to do everything you want.

I’ve mostly been sticking to smaller conventions and have been having fun despite the smaller scale. Tickets are way cheaper too. Maybe try a smaller event to see if you like the vibe.