Just found this great review overview by Gartner for Multichannel Campaign Management (MCCM) software. You can select vendors and compare the reviews in detail.
https://www.gartner.com/reviews/market/multichannel-marketing-hubs
Overview of vendors | Detailed comparison |
An overview about the Gartner “Magic Quadrant for Multichannel Campaign Management” from April 2017 you get here: https://www.cmswire.com/digital-experience/gartner-names-7-multichannel-campaign-management-leaders