Flameshot is a really nice screenshot tool, but the big drawback is, that it only upload to Imgur, one of the worst Data hogs. The best and most complete is ShareX, there you can set the destinations to your like, but it has also a big drawback, it's Windows only (depends on NETframework, same as Greenshot)
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You can use Flameshot, but recomment to store the screenshots only locally and upload to share/host later to, eg vgy.me, or some self hosted one, like FileCoffee (valid for all type of files, image, video, multimedia, documents, presentations, etc.)
It'd say just as good. I prefer the text based menu of greenshot. The options in this are all icons, so I end up hovering over them all the time to confirm what they are. Works just as well, otherwise.
Got this installed on all my work machines - if you're wanting to stick a screenshot on Jira or Slack with a couple of arrows, wavy lines, or a bit blurred out then it's dead quick and has just the functionality that you need. Yes, it's simple and lacks a lot of 'power tools'. Sometimes that's just what you need, tho.
If you’re running Windows I would suggest looking into ShareX. It’s a million times better imo. Support for custom uploaders, video and gif recording, etc. It’s also free and open source.