For those who are into miles, what cards did you use for wedding-related expenses? I'm quite new to the miles game and I'm wondering if I applied too many, my miles might be diluted.

Because you're just started. I don't recommend managing too many cards at the same time. Large purchases, resulting in a shortage of credit on a single card, can also be easily solved by topping up your card, and you don't need many cards.

Spending on weddings is not usually counted as spending on restaurants or hotels. So, just in case, a common mileage card is more suitable.

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Consider how quickly you accumulate miles, and how often you travel. You can make a choice between a card where the miles don't expire, or a card with a high mileage return.
Representative players are Citi premiermiles Card and UOB prvi miles card.

Always check mcc for credit card spendings