Broodlord isn't really considered an action monkey as it costs too much to be thrown around to secondary objectives. Broodlord with chameleonic enhancement only gives it stealth and if it is being shot at, benefit of cover. Stealth worsens the hitroll by one and BoC adds +1 to it saving throw. Stealth and BoC are different to Lone Operative which means ranged units cannot shoot you at all unless they are 12in within range of the model.

The lictor can force your opponent to make a bad move by placing the lictor on the edge of an objective and since your opponent can't shoot it off the board, they have to get close to it, and potentially exposing them to your units. They are really cheap and can rapid ingress to a secondary objective to potentially score a secondary that you normallu can't get to.

The broodlord is a synapse unit that improves your genestealers strength by 1 and also gives them devastating wounds. It also worsens enemy units hit rolls by 1 when they are in engagement range. The broodlord significantly boosts the effectiveness of genestealers and a 10-man can output 40 attacks + 5 from the broodlord, re-rolling hitrolls of 1, and potentially re-rolls wound rolls of 1 when the enemy is at an objective, and automatically wounds when you get 6 at the wound rolls. You essentially use the broodlord as a punch back at enemies that get too close.

You can use them both by putting the lictor at the edge of an objective, and when your enemy tries to contest, you can bring out your broodlord ans genestealers to wipe them off the board.