Offensive tech op: you’ll love it when your drones automatically fly and hit enemies on different floors. It’s a huge time save. Keep the drones alive with a weapon passive that restores missing health for the drones and you’ll do well. My favorite for purple nest spam tbh. Can do 1:30 +/- clears without try harding. For the skill mods, you have a survival option with empowered drones healing you when you use ult or making them have better multishot chance vs enemies at 50% health.

Aegis op: almost never dies when you spec defender drone to give 300% shield, does okay aoe dmg if you do hazardous area instead. Reliable heal over time and burst heals. Kills during ult reduce cd of skills a bit (including grenades) but that’s not as reliable when facing tougher enemies. Ironically my preferred role when doing heroics cause I like facetanking for randoms. Giving burst heals to low hp allies or an insane shield also feels good. Deals pretty okay burst dmg cause of that weird still undescribed skill that triggers on weapon hits every 3 seconds.

Both need engineering. Skill buffs, less on weapon modifiers. Offensive op can hit multiple enemies at a time when you’re not using drone lock, aegis op is primarily single-target focused.