Objective To evaluate the most preferred style of online didactic lectures. The COVID-19 pandemic has had a significant impact on surgical resident education, instigating a major shift towards online webinar didactics as a major of resident teaching. We hypothesize that a case-based format of online didactics are the most preferred format for this style of lecture. Study Design We analyzed viewer evaluations following 82 online hour-long lectures in the Urology Collaborative Online Video Didactics Lecture Series. We categorized each lecture as case-based, guidelines-based, practice updates, or surgical technique-based and assessed viewer responses to survey questions regarding subject area relevance, lecturer knowledgeability, lecturer effectiveness, and usefulness to learning. We performed logistic regression to control for viewer level, instructor level, and lecture topic, and using surgical technique-based lectures as the baseline variable. Results 2176 evaluations were analyzed. Case-based, guidelines-based and practice updates were all scored significantly higher than surgical technique for subject area relevance. Case-based and guideline-based lectures scored significantly higher for usefulness to learning. Case-based lectures scored significantly higher for lecturer effectiveness. There was no significant difference in scoring between any lecture style when rated on lecturer knowledgeability. Conclusion When preparing online webinar based didactics for surgical resident education, case-based lecturers appear to be the most preferred and well received lecture style, followed closely by guidelines-based lectures. Practice updates and surgical technique-based lectures are less preferred formats for this teaching modality. Copyright © 2021. Published by Elsevier Inc.