Pros:

• ShareX offers a greater variety to customize your images, when making the captures you can choose different shapes (rectangles, triangles, ellipses, polygons, etc.), and more. And it is above all easy to use. Not only does it take screenshots, but it also allows you to load text and capture / upload a video.
• It allows to upload images to Imgur, ImageShack, TinyPic, photobucket, Dropbox, Google Drive, etc.
• Also compatible with the registration of the accounts of xat.com. Make the screenshot, and automatically open the image from the Host that determines (By default this Imgur), without opening a link, then save to the PC, open a Host, upload the image and finally just get the image . We saved this long process.
• You can make screen recordings, in Gif and FFmpeg formats.
• There are many more features than I can mention here. Check out their wikipedia page for more information.

Cons:

• Only compatible with Windows.