I don't see why TDD and Code Reviews are mutually exclusive choices. You can easily use both (or neither) on a project, or mix and match, or use one on one par

I don't see why TDD and Code Reviews are mutually exclusive choices. You can easily use both (or neither) on a project, or mix and match, or use one on one part of a project and the other elsewhere. Knowing what each of them are is the on, knowing which to use when and where and how much is the at.