You may have difficulties with the choice of a CPU, you will solve them by seeing the full test Apple M1 Ultra Cinebench r15 score single and multi core and decide is it a good CPU or a bad one to buy, how powerful is this processor. Here is all information from Cinebench r15 benchmark. A careful review of all the technical characteristics, to make it easier to read, is presented in the form of the table. After looking at the data this test and video, you can already make an briefed decision about do you need to buy Apple M1 Ultra or not.
All the number in the text above do not mean that you should be guided entirely by them and trust a simple quantitative comparison. Better to watch the video tests and read the opinion of real owners of Apple M1 Ultra before deciding buy this CPU or not.