Subject detection starts the job
Eye, animal, bird and vehicle recognition help the camera decide what matters in a crowded frame. The best system for you is the one trained for your subjects and supported across the focus modes you actually use. Menu simplicity matters because a sophisticated mode is useless when it takes too long to activate.
Burst speed needs a buffer
A camera may advertise 30, 60 or even 120 photos per second, yet record that speed for only a short burst. Check how long the buffer lasts, whether autofocus and exposure continue between photos, which file format is used and how quickly the card clears. Ten dependable photos can beat fifty compromised ones.
Video modes have conditions
Look beyond resolution and frame rate. Check whether 4K 60 uses a crop, whether autofocus remains available, whether recording overheats, and whether stabilization introduces a further crop. Ten-bit recording can preserve more editing flexibility, but only if your software and workflow support it.
Audio and monitoring matter
For interviews, events and YouTube work, a microphone input can improve the result more than another stop of dynamic range. A headphone output helps catch interference before the recording is finished. A fully articulated screen is useful when you work alone, while a tilting screen can be faster and more discreet for still photography.