Perhaps you can't decide which processor to buy, you can make a choice by looking at the Intel Core i3-9100 GeekBench 5 score multi and single core test and decide is it a good processor or a bad one to buy, how powerful is this processor. Here is all information from GeekBench 5 benchmark. A careful review of all the specifications, to make it easier to read, is summarized in the table. After looking at the data of all test and video, you can already make an briefed decision about do you need to buy Intel Core i3-9100 or not.
The summary data in the text above do not mean that you should be guided entirely by them and trust a simple quantitative comparison. Better to watch benchmarks video and read the reviews of real owners of Intel Core i3-9100 before making a decision buy this CPU or not.