When buying on Shopee, is 10% cashback better or 4mpd earn from credit card?

Would assume you are referring to the Shopee Cashback via promo code or something similar?

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Well, it depends on your spending pattern but mostly I would go for the 10% cashback. Plus Shopee sometimes also have those vouchers during the promo campaigns such as additional $50/$80/$100 off when you purchase big-ticket items (usually electronic goods). I thought about using a credit card but for the amount spent, the cashback definitely looks better to me. I don't suppose most credit card got 10% cashback rate?

Depends on what is your purchase savings aim and will you be buying from Shopee again for 2nd time, if yes then the 10% cashback via Shopee coins, is quite a viable option.