Advantages of the supermarket: optional, refundable, reversible, small, one-stop, free bus (time-limited) special price (meaning cheaper than the morning market), near the shelf life price (quite cheap), relatively fidelity.

Disadvantages: the price is high (referring to the same quality), and seafood is basically not available. Its freshness and price are quite unreliable.

If you have rich experience in shopping and living, if you have made no mistakes, there is basically no disadvantage. Only one thing: it is easy to buy more blindly.