Insights Needed on Employment Verification and Phone Number Sources

Hi everyone. I am currently working on a table and wanted to hear some thoughts from the community.

1.
Currently deploying Claygent Argon to verify employment status. Costing 3 credits per run and wondering if Neon or even Helium could be accurate options. Testing output reasoning Neon looks solid. Any thoughts?
2.
In my experience with Phone Number waterfall enrichment the accuracy of the number found varies between ICP. I've seen ICP A get high hits on Wiza but they are wrong numbers while ICP B has a high hit rate on Wiza but they are mostly accurate. Targeting enterprise HR depts. in this use case. Are there specific phone number data sources that will be more accurate than others for this specific ICP?