No Army Rule, should I just use Deathwatch instead?

Given that there's no army bonus to running full Imperial Agents, should I just use the deathwatch index instead?

As a new player I feel like I made a mistake going into Imperial Agents as they seem to have no identity and little support from GW as far as fleshing them out as a new faction. It's hard for me to get into the lore when the whole unit composition is a hodgepodge a half dozen different sub factions.

Given that I only have a combat patrol and 20 DW vets, I think I might just abandon Agents due to them being so aimless.

Edit: As an update I made a 1000 point list with what I currently have and will run with it until I decide if I want to dive into Deathwatch. A Hybrid army that I can switch between them with lots of list options seems like where things are headed.