When comparing Microsoft Game Bar vs ScreenFlow, the Slant community recommends ScreenFlow for most people. In the question“What are the best tools for recording gameplay videos?” ScreenFlow is ranked 7th while Microsoft Game Bar is ranked 12th.
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Pros
Pro Auto runs in any games
When you run the games, it will automatically be launched.
Pro Low resource usage
It could record HD recording with lower resource usage compared to OBS.
Pro Easy to use
The interface is user-friendly.
Pro Pre-installed in Windows 10
If you are a Windows 10 user, it is already installed.
Pro Can export to animated GIFs
Pro Non-expiring trial available
The free trial never expires, however it will place a sizable "Demo Mode' watermark over the middle of the screen which makes the content unusable for anything other than trying it out.
Pro Suitable for novices and experts alike
Start creating vanilla screencasts. Continue exploring a plethora of presentation and editing features. You won't ever grow out of this "shirt".
Pro Records your iOS device too
You can plug your iOS device into your Mac, and record the screen through your Mac. You can find details on how to do this here.
Cons
Con Creates large (e.g. mp4) files
Work-around: Export using lossless codec, then use Handbrake to create your production mp4.
Con Free version produces virtually unusable content
The free trial adds a large watermark to the middle of the screen which makes the video virtually unusable. Most trials expire after a week or two, however the content you create with them can still be used.