INTEL:
It does vary depending on your PC use, however, for office work, the i5 8th Gen is a recommended CPU as it can handle the requirements for office use without stress. For Gaming and high-end use, the i9 is a recommended CPU as it can handle games easily without stress.
AMD:
AMD Ryzen 3 3300X is good for office work and can handle office scenarios and the AMD Ryzen 7 3800x is good for gaming and high-end use.
Hope this helps,
Azumayay