EVO collaborator
I think both are slow and bloated (especially the desktop version)
Seeing that I want to sync everything for my work I need this to work well and fast.
Ever since 2014 Iv started using a plugin for Outlook to help out with my syncing.
Check out EVO collaborator. Might make things work more smoothly for you guys too.
Found this blogpost about it for this interested : http://outlookandmacosxserver.blogspot.com/2014/10/synchronize-androids-contacts-and.html