No matter which processor you decide to buy, you’ll be getting a quality processor that will last you a long time. However, every purchase is a balance between cost and performance. My recommendation is to use a site like CPUBenchmark to get details about each processor you are considering.

For example, the top of the line Core i9-7980XE has a terrible CPU value score because of its high cost:

Use this tool along with your budget and needs to determine the best processor to purchase. Even if you aren’t planning on buying a CPU, hopefully this gives you a good idea on the differences between the Core i3, i5, i7 and i9 processors from Intel