QuickTime  vs ShareX

Unlike other video players, QuickTime offers recording and editing opportunity. To unlock this features QuickTime Pro 7 is required, which is a fee-based software (29.99$). Program features include possibility to record video and audio directly from microphone, FireWire camcorder and iSight camera. Speaking of video editing, cutting, deleting, resizing, flipping, or rotating a movie is possible.

QuickTime video player has "Zero-configuration streaming" - video player automatically determines best connection speed. Plus, it can automatically reconnect, if the connection was lost. Step by step video file stream or broadcast guide can be found in the source.

QuickTime is developed by Apple, which is known for its plain, but gorgeous and user-friendly design. QuickTime is included in the list of default programs on macOS systems, so it is a good free option for beginners and users who love style and comfort.

Look up Posh and see if you think a software movie player should be POSH. What a hoot.

Designed as file uploader in the first place, ShareX supports overhelming amount of services for you to upload your files to and the list is expanding.

ShareX is licensed under GPL with source code available on GitHub.

You can choose what shortcut key to bind your command to, as well what host it uploads the file to.

When you enter a capture mode, the screen content is preserved as it was when you started capturing by default. However there is a special "Light" mode where the screen does not freeze.

Apart from still images, ShareX allows the user to record unlimited video with all the options available for normal image capture.

Capturing (screen, video, a window, etc.) with annotation + automation makes for some powerful workflows.
Annotation is key for research on any project size. Capturing screenshots, editing them ("annotating"), converting to a PNG, removing the background to make a transparent version, saving to google drive, creating large+med+sm sizes, uploading thumbnails, is an example of a workflow you could create. The list goes on...

You'll find the same strength & depth in features for image handling also for text, videos, other files by type, and on and on..

It has its own screen editing tool.

It is great for creating software tutorials or highlighting new features in a sales function - nothing beats a well-placed animated GIF in an email.