F5 APM vs. UAG for VDI-Only Deployment

[JGillATN]

I have come to understand that I can use F5 APM to replace nearly all functionality that the UAG performs.   However, there is no clear recommendation on which is preferred and why.   Can an F5 replace the UAG functionality?   What can UAG do that the APM cannot, other than make my life more difficult by adding complexity?    Why would you want to have both a UAG and a F5 with APM?   There must be a reason why I continue to see designs and deployments with UAGs behind an LTM with APM capabilities.   Any help would be appreciated.   I am looking at LTM v14-15, which appears to offer full proxy for Horizon natively.  

[JGillATN]

Notable from F5 Deployment Guide: 

BIG-IP v14.0 and later with iApp version f5.vmware_view.v1.5.5 and later adds support for Blast Extreme connections in addition to PCoIP connections if you are using BIG-IP APM. When using v14.0 and later with v1.5.5 of the iApp template, the iApp automatically creates a virtual server for Blast Extreme connections.

DevCentral  Link with respect to enabled BEATS.