This is probably one of the more frequent questions that I hear. For the most part, I get asked this question by beginner photographers, which is fine of course. Unfortunately, it's not always easy for me to give a straight answer, because there are a lot of factors to consider. Despite this, I think this video may help provide some answers.
A recent video from Matt Granger discusses this very topic. The video aims to answer some of the questions many beginner photographers may have when deciding on camera systems. With all the different makes, models, and brands to choose from, it can be a little overwhelming. The main point that Granger makes is how second hand equipment can be brilliant options for people starting out or photographer looking for the best value for their money.
Cameras that were released five or more years ago, haven't suddenly become worse. These cameras are still as capable as the day they were first released and they were the best at their respective time. I think buying a second hand camera from a reputable retailer, can be an excellent way to get some of the best equipment for very little; in comparison to buying brand new current camera models, at the same price.
Check out the full video linked above to see some of the equipment tested and recommended by Granger.