What's the difference between enfeoffment system and county system?

First, the enfeoffment system is related to the patriarchal clan system, based on blood relationship; The county system is implemented under the condition of great unity, divided by region. Secondly, the enfeoffed vassal throne is hereditary and has fiefs; County officials are appointed or removed by the emperor or the court, and their official positions are not hereditary. Third, vassal states have strong local independence and are easy to develop into separatist forces. Counties are local administrative organizations, which are conducive to the strengthening of centralization and national unity. The main difference between the two lies in the restrictive relationship between the central government and local governments and the size of local power.