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Intel Core i5 9400 vs Intel Core i3 2100 Legacy Series
While the Intel Core i5-9400 makes for a passable CPU for its asking price, the Intel Core i3 2100 simply doesn't make the cut and should be avoided by most people. In both cases, however, you might want to look at some better alternatives at the $260 budget range.
If you nevertheless want to learn more about the Intel Core i5-9400 and the Intel Core i3 2100, however, we wrote a short summary of what we know about them:
Windows Central, a review site with a history of doing objective hands-on testing, has great things to say about the Intel Core i5-9400. In fact, it's "Best Value" in its "Best Intel CPUs in 2020" roundup, which points toward it being a good CPU.
As for the Intel Core i3 2100 - Techradar, a source that conducts reliable hands-on testing, has featured it in its Intel Core i3 2100 review roundup. However, it didn't make it to any of the top spots.