The anonymous nature of darknets is commonly exploited for illegal activities. Previous research has employed machine learning and deep learning techniques to automate the detection of darknet traffic in an attempt to block these criminal activities. This research aims to improve darknet traffic detection by assessing a wide variety of machine learning and deep learning techniques for the classification of such traffic and for classification of the underlying application types. We find that a Random Forest model outperforms other state-of-the-art machine learning techniques used in prior work with the CIC-Darknet2020 dataset. To evaluate the robustness of our Random Forest classifier, we obfuscate select application type classes to simulate realistic adversarial attack scenarios. We demonstrate that our best-performing classifier can be degraded by such attacks, and we consider ways to effectively deal with such adversarial attacks.