I would put VNDLY first on the list for any enterprise that already runs Workday HCM and wants contractors, agency temps and SOW workers counted in the same headcount and cost reporting as employees. That link is the whole reason Workday bought the company, and Workday's own pages pitch VNDLY paired with HCM for total workforce reporting.
Outside a Workday estate the case is weaker. The 2021 acquisition release said VNDLY would keep integrating with third-party HR, finance, IT and legal systems, but current product pages barely mention non-Workday HCMs. A company on SAP SuccessFactors or Oracle should compare it against suite-neutral tools such as SimplifyVMS before assuming it fits.
The product itself is well regarded by analysts: Workday's product page cites Everest Group's 2026 VMS PEAK Matrix, where VNDLY placed as a Leader and Star Performer. Customers named on the product page are Peloton, College Board, Banner Health, Huntington National Bank, Medtronic and Illumina.