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I'm not sure whether this is the appropriate forum to discuss "EPG vs. RAC", but I'll share my thoughts with you:
EPG uses the XDB-HTTP-Server, which is not clustered. The URL you enter points at a single RAC node and there is no load balancing through your different RAC nodes nor any failover. I think it's obvious that this makes such a scenario "not recommended".
APEX Listener has been designed with focus on APEX. If you depend on certain DAD-features, you should stay with OHS.
You can make APEX use Database Authentication rather than its native internal authentication mechanism, though I'm not sure the result would be what you expect. APEX is a complete framework for easily building database driven web application. Web DB was aiming a bit different. As far as I remember, it was replaced by Oracle Portal and HTML DB, i.e. the functionality was split up into two products. Possibly you are more interested in the successor of Oracle Portal (Web Center) than in the successor of HTML DB (which is APEX).
To be more helpful for you, you may give us more information on what you are actually aiming at.