Google may have a wider range of words, but DeepL is definitely much better in grammar and idioms, which Google tends to translate literally.

Moreover, Google often provides a single target word; whereas DeepL allows you to select from a range of synonyms clicking on a word, and will adjust the sentence accordingly to use the new word. When Google gets the context wrong and provides the wrong meaning for the translation, DeepL's capability to translate with a different meaning is invaluable.