There are NSX Advanced for Horizon and NSX Enteprise for Horizon
For customers that has existing NSX for Horizon, you will be eligible for NSX Enteprise for Horizon.
See this KB: NSX Editions Fulfillment (2145080) | VMware KB
Beginning on May 3, 2016, with version 6.2.2, VMware NSX is available in three editions: Standard, Advanced and Enterprise.
If you are an existing NSX for vSphere customer with an active support contract, you will get an alert in My VMware that you are eligible to use NSX Enterprise. You need to upgrade your license keys to use NSX Enterprise.
If you are an existing NSX for Multi-Hypervisor customer with an active support contract, you will get an alert in My VMware that you are eligible to use NSX Transformers. You need to upgrade your license keys to use NSX Transformers. These keys also work for you to use NSX Enterprise.
Beginning on June 9, 2016, VMware NSX Enterprise for Desktop is available in addition to VMware NSX Advanced for Desktop (previously released on May 3, 2016).
If you are an existing NSX for Horizon customer with an active support contract, you will get an alert in My VMware that you are eligible to use NSX Enterprise for Desktop. You need to upgrade your license keys to use NSX Enterprise for Desktop.