A single set of extensions and bookmarks. With Chrome, even if you manually sync your profiles and keep the same set of extensions installed in both profiles,

A single set of extensions and bookmarks. With Chrome, even if you manually sync your profiles and keep the same set of extensions installed in both profiles, it runs 2 processes of the same extension. Even when the second profile window is closed. But for me the deal breaker was managing a separate set of bookmarks.