Perhaps you can't decide which processor to buy, you can make a choice by looking at the Intel Core i3-9300 Cinebench r15 score single and multi core test and understand is it a good processor or a bad one to buy, how powerful is this CPU. Here is useful information from Cinebench r15 benchmark. A thorough review of all the specifications, to make it easier to understand, is made by the table. After reading the results of parallel test and video, you already be able to know do you need to buy Intel Core i3-9300 or not.
However, it should be understood that the summary data that you have looked at here do not mean that taking them into account you should fully trust a simple quantitative comparison. Better to watch the testing video and read the reviews of of people who bought Intel Core i3-9300 before making a selection buy this CPU or not.