I've written many computer hardware recommendations for both business and home users. My process is usually as follows.
Determine if an Apple Mac or a MS Windows based PC is the best fit (ignoring things like Android or IOS based devices for right now). Both are capable devices but the former still fits better in most educational and graphic intense areas, the latter in business and more general purpose areas (including gaming).
Determine if a desktop or a portable laptop is the best choice. The former here is usually more powerful and more versatile as far as hardware options go, the latter is obviously necessary for portability plus a separate monitor/mouse/keyboard can be added to make it more "desktop-like".
Your point about "... features that are important ..." usually depends on the next topic of what exactly the computer will be used for. Someone working mainly with large spreadsheets, like an accountant or someone who manages people, products or budgets, would probably need a wide screen monitor, like a 17 inch laptop or a desktop with a 25 to 27 inch monitor. Someone needing to use a computer both in a classroom and in a cramped dorm room would probably want a smaller, lighter laptop like a 15 inch or even smaller. Determine and list your specific needs.
Processor and memory basically determine the speed or responsiveness of the computer. Everyone wants the fastest computer available but cost is usually the determining factor here.
Some people may have other requirements to consider as well. Maybe you need to purchase the computer locally so that you can get help installing software and for technical problems quickly, if needed. In that case, you may want to consider computers sold only at local stores that offer these services.
Once you have the basic features you are looking for written down, rate them as “Required”, “Nice to Have” and “Not really necessary”, then begin your online research. The links I've provided are the sites I usually go to for reviews of features and speed test results. Since new computers are constantly being released to the market, it is sometimes a good idea to start with a simple search on one or more of the main shopping sites (Amazon, BestBuy, etc.) to see what the "Best Selling" or "Newly Released" computers are for a given type (images can usually be gotten from these sites as well).
Be aware that sometimes review sites will get new computers in advance of their being released for sale to the public so some of the reviews they publish may be on computers that you can't actually buy yet. Again, check the major shopping sites before determining which models are the recommended ones.
I've always found it useful to include a chart, along with the written report, just to summarize the major features that were considered and maybe the 5 top models that were considered, along with how well the models fit the features and the best price and source of that price, that you found.
I hope this helps.
Good luck with your report.