[collyw]

Integration tests catch more bugs.

In fact unit tests are fairly low on the scale, according to this: https://kev.inburke.com/kevin/the-best-ways-to-find-bugs-in-...

[flukus]

Bugs caught is only one axis though, they other is effort. Unit testing is much lower effort, particularly for edge cases (what happens if dependency x throws exception) which may be hard/impossible with integration tests.