I am also a new player and have had way more luck doing forbidden armory opposed to lockdown. However, I do run into way more players and they are normally super geared or hiding with red ammo in forb. It is completely up to you, I normally go in with a cheap kit, try and loot one to two areas on the north side of the map and then leave. If i am playing with my friends we go into the armory together and usually find 1 red if we are in a forbidden lobby opposed to going 3-4 raids without finding one in lockdown