The feeling is so different even if the casinos are crowded, I play slot machines and other table game like baccarat and poker and the excitement and the experience is really a different unlike in playing online where you just touching your screens. I do not say that crowded casinos are much more better than online casinos but the the experience are really different. But there are disadvantages like today where the virus is spreading and it is better if we will stay away with the place that are crowded. For those gamblers, it is really better to play online casinos nowadays.
I think it really depends on the people, as long as he will not be disturbed and can enjoy the environment surrounding him while gambling. However, I still agree with this one, the pressure and experience is very different when you are inside the casino. The gamblers surrounding you somehow add to the experience of playing. When you are on the table, the facial expression of other players can somehow brings the thrill in you too. The winning moment is different too. But if the OP is talking about a crowded casino which will affect your privacy and enjoyment in gambling, then its better to play online.
PS. because of this pandemic, forget what I've just said, its better to play online for safety. Aheks.