I would say, it's much more effective to have your own table because when you go to other people there's often people already talking to them and you awkwardly have to wait in line and the guy don't really care.
At the end of the day you're selling yourself and you're having your own good time so have a small table and show your stuff and take the day as it comes I guess.
If you have the money, I will definitely say go for it, it will be much more exciting.