It's like Canon versus Nikon but on a slightly different scale. Even if you don't have the money to buy an ARRI or a RED, you can still rent them. Which one would you get? This video will help you get acquainted with their peculiarities.
If we speak about the image quality, no doubt you will choose the one whose look you prefer more. They can both deliver great visuals that can be color-graded in an infinite number of ways thanks to the high-detail file formats these cameras support. In this video, the author goes through the usual features small-production filmmakers seek in a video camera and what to expect if you happen to use any of these cameras for the first time. He compares their menu systems, their reference audio capabilities, image resolution, file sizes, build design, reliability, and others. Each brand has their weaknesses and strengths, but the advices you hear from the video may help you choose one instead of the other in particular situations. For example, if you need reference audio, RED has a built-in microphone, while ARRI expects a pre-amplified (by an audio mixer) audio signal. But if you need to utilize third-party recording media or batteries, you can use trust ARRI's system, while RED works with their own proprietary hardware. The author also will teach you how to make a better guess which camera is which based on their default color and contrast preferences.