DotNetNuke vs Drupal or Wordpress with Flutter

Hi, I'm a designer and I design web sites and contract with programmers to
code them and recommend the best platform. I have a couple web sites being
built in DotNetNuke. I would like more information from a neutral party to
help me determine if it would be in the client’s best interest to
customize the functionality for the products and staff pages in DotNetNuke
or start over and build the site in Drupal or Wordpress with Flutter. There
are about 80 separate product pages and 40 staff pages. They need to cross
reference. The products pages need to be accessed by alphabetical order,
category, product expert and usage. Customization of a data base has been
proposed to create and manage these pages. The developer told me that once
the Excel spreadsheet is created, he can program it so that the pages are
all created instantly and they will cross reference each other. My concern
is that once it's customized, the CMS aspect of DotNetNuke will be become
complicated for the client or lay person to use. And ease-of-use is why I
wanted it build in a CMS in the first place.

Please offer your recommendations. Thank you for your response and your
comments. Thanks Teresa