Professional cameras can be both mirrorless and mirrored, but they are still Full Frame or full frame, which means that there will be some variations, such as weight and ergonomics, but the quality will still be good.
Currently, there has been a dispute in defining which one is better, because both types serve the same task, but have advantages and disadvantages over each other. Here are the differences between them.
FF mirrorless camera. The FF mirrorless cameras, make the light, instead of passing through the typical optical viewfinder of a traditional reflex camera, arrives directly to the sensor. This makes the device less complex and more practical.
FF reflex camera. In reflex cameras, we will find this famous viewfinder, which will complicate the task of getting the light to the sensor, but will make factors such as autofocus more effective. Also, there will be more complexity in the system and it will make it a big and heavy tool.