Until fairly recently the choice between a 32 bit or 64 bit application install was a fairly easy one. While 64 bit had its advantages the idea of running a 64 bit version of a product like Microsoft Office was simply a no go. Your preferred Document Management System typically would not integrate, your add-ins would crash or simply not install. All around a completely untenable solution. As 64 bit has become the norm at the OS level applications and add-ins have begun to follow suit.
Microsoft now recommends 64 Bit OS Office whenever possible to avoid limitation in the 32 bit versions of Office. Where the 64 bit platform really shines is in the area of memory management. 64 bit apps with their greater addressable space simply standup better to the demands of modern computing. This has the positive effect of alleviating the age old issue of wacky display problems, black boxes on screens and application crashing. This is not to say that 64bit is a silver bullet. It does, however, go a long way towards eliminating these problems.
To avoid possible headaches, a good review of your 3rd party Office integrations for 64 bit support should be considered when deploying Office.
For further information and to review Microsoft’s position we recommend reading the following article: https://blogs.technet.microsoft.com/outlooking/2017/09/06/32-bit-outlook-interface-elements-unexpectedly-render-in-black-white-or-blank/