I am planning a Drupal 7 site for video sharing, where registered users can share videos.
Main Site: example.com
Subdomain for blog for registered users would be: blog.example.com.
The database would be different for main site and subdomain. Since the target of main site would be very high traffic, what would be the efficient choice ? either Multisite or Multiple Drupal installation (one installation for Main and another installation for blog) ?
what would you advice and why ? (I mean from personal experience, difficulty to handle and maintain, performance issues, etc)