SAP Netweaver Addon for Event Enablement VS Enterprise Event Enablement

Hello Event Enablement Experts

We have both options SAP Netweaver Addon for Event Enablement Vs Enterprise Event Enablement available in the SPRO of our S4HANA System. I see that SAP Netweaver AddOn for event Enablement is provided from ASAPIO and the Enterprise Event Enablement is from SAP. Is the ASAPIO addon available by default? Any specific reason we have 2 different event enablements?