Due to different platform contexts and their distinct features, users often utilize multiple platforms to satisfy their needs. This paper concentrates on the behavioral differences among cross-platform users of academic social networking sites, with a comparison of different institution types in which the users are affiliated. The cross-platform data was collected from Academia.edu (ACA) and ResearchGate (RG), 15 institutions from Academic, Government and Corporate were selected to find their cross-platform members and to analyze their behavioral differences from perspectives on information disclosure, academic publication, and social interaction. The findings indicate that cross-platform users favor RG over ACA and are more likely to share comprehensive information, expand their social networks, and engage in RG-specific interactions. Government Institutions perform the most actively, demonstrating high levels of information disclosure, publication, and social interaction. Corporate Institutions have distinct strengths and weaknesses, while Academic Institutions display average performance. This study contributes in understanding the cross-platform behavioral characteristics and preferences of users from different institution types.