Consider rewriting to:

"Testing routes can be done both via integration **or** unit tests. Integration tests will likely provide better tests for routes because routes are typically used to perform transitions and load data, both of which are tested more easily in situ rather than isolation."

Reason: remove duplication of "integration tests", and we were effectively saying "integration tests are better because integration tests are better". Just changed it to explain why they're better in this context (hopefully!) :)