I like instant (why would anyone like delayed?), this is why I prefer web3 casinos as there you make a bet and if you win, funds are instantly received in your wallet.
To me it is better to get the winnings safe rather than immediately. Naturally, the fast payouts are fantastic but I would prefer to wait several hours or even a day when I would know that the payment is troubles-free and safe.
Why would immediate withdrawal be unsafe?