NewRelic is primarily known as a strong APM solution whereas ControlUp is probably associated with EUC/Citrix (similar to Goliath)... I'd assume NewRelic interest would show some need to do APM ... eG do both EUC and APM so we have some pages on NewRelic
https://www.eginnovations.com/compare-java-apm/new-relic-alternatives and
https://www.eginnovations.com/blog/evolving-needs-of-apm/ might give an idea.... it would initially seem a odd to choose NewRelic if the only thing monitored was Citrix Infrastructure which suggests to me someone has identified a need for "converged application and infrastructure" monitoring and analysis. The kind of territory where you see folks using AppDynamics with Netscaler plugins if they are APM primarily....
@Barry Schiffer knows the EUC+APM area better than me though - but sounds like there might be a difference of view on what is the primary monitoring need. Be interesting to hear the outcome!