Hi Shandy
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MacUpdater has a human created database. Updatest supports: Sparkle apps (common), Homebrew, GitHub, Electron and Mac App Store (iOS/normal apps). Brew and Mac App Store require Brew/MAS CLI respectively.
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There likely are a few, mainly things not found in Homebrew. We support most major apps like Office suite, Slack, Developer stuff like Visual Studio, etc. It really just depends on if the developer has created a cask in Homebrew or not, which is pretty rare.
Updatest takes a programatic approach to find updates. In some cases it finds more than MacUpdater as it doesn’t require a human to validate. In some cases it finds less than MacUpdater for more niche/smaller apps that don’t support the sources Updatest uses (Brew, Sparkle, GitHub, Electron, Mac App Store).