First of all, the official turnover machine refers to the second-hand mobile phone that is overhauled and maintained by the original factory or an authorized third party to restore it to the original factory standard. The official turnover machine has the following advantages:

1. Reliable quality assurance: the general official clamshell machine will undergo strict inspection and maintenance, and the quality is relatively good and more reliable.

2. After-sales service: Official turnover usually provides after-sales service from manufacturers or authorized companies, including warranty period and after-sales support.

The price of the official clamshell machine is relatively high, and there are relatively few choices in the market.

Second-hand quality products refer to second-hand equipment sold by users themselves, which has the following advantages:

1. The price is relatively low: the price of second-hand superior products is usually more close to the people than that of the official clamshell machine.

2. Large selection: Because the second-hand excellent product market is relatively broader, there can be more choices.

However, when buying second-hand excellent products, we also need to pay attention to the following issues:

1. Equipment quality: The quality of second-hand equipment may be damaged to varying degrees, so you need to check it carefully before buying.

2. Security issues: When buying second-hand equipment, pay attention to confirm whether the equipment has been tampered with or locked by hackers to protect personal information and user experience.

On the whole, if you pay more attention to the reliability and after-sales service of equipment and have a generous budget, then the official clamshell machine may be a better choice. If your budget is limited and you don't have high requirements for equipment quality and after-sales service, you can consider choosing second-hand quality products.

Of course, no matter which way you choose, it is recommended to fully understand the condition of the equipment and related warranty policies before purchasing, so as to ensure that the purchased equipment meets your needs and expectations.