The advantage of two credit cards in the same bank is that the supplementary amount is not enough. One overdraft has reached the limit, so use another one. Nothing else is good.

In fact, under normal circumstances, the credit card of the same bank is enough. If you sometimes feel that the quota is not enough, you can ask the bank to temporarily increase the quota. Usually banks will meet the needs of users. So you don't have to apply for two credit cards in the same bank.