If you have difficulties with the choice of a processor, you will solve them by looking at comprehensive benchmark Intel Core i9-9900 Cinebench r23 score single and multi core and understand is it a good CPU or a bad one to buy, how powerful is this CPU. Here is all information from Cinebench r23 benchmark. A careful review of all the specifications, to make it easier to read, is made by the table. After looking at the data of parallel test and video, you can already make an briefed decision about do you need to buy Intel Core i9-9900 or not.
All the number in the text above do not mean that taking them into account you should undividedly trust a simple quantitative comparison. Be sure to watch benchmarks video and read the opinion of of people who bought Intel Core i9-9900 before making a decision buy this CPU or not.