New is a fix for a crash on macOS which occurred on exit. Additionally there are improvements for dragging entries to move / copy, Quick Unlock is automatically enabled when unlocked for Auto-Type or browser access, and the Auto-Type button and shortcut are disabled when the Auto-Type setting is disabled for the entry or group. Complete Changelog is available on https://github.com/keepassxreboot/keepassxc/releases/tag/2.7.6
I can just say why I use the original over XC: WebDAV built-in. Still hoping for this to come to XC, bit last time I checked it was considered out of scope.