I've gone to using one list as much as possible, but that's mostly about tightening up my own gameplay. One list, play the everliving crap out of it. With my Nomads, when I do take a different list, I usually keep a consistent core and vary around the edges. Partially this is for fluff purposes. I'm a big fan of my Interventor LT, the Specula Killa. I always start with my Interventor LT, a Clockmaker with two Zondbots, at least two infiltrating specialists (Zero hacker or Moran FO), and 2-6 Chain Rifle Morlocks. I usually include two attack REMs (Tsyklon, Luno, Reaktion, or Puppet Troupe). The rest is up for grabs. Maybe a Tomcat or a Hellcat, Mary Problems, a Hollow Man, an Interventor KHD, Zoe and Pi-Well, EVO bot, or Salyut and/or Transducer cheerleaders. Right now, I tend to play towards the midfield. Infiltrate and do objectives/lay mines/set koalas/suppressive fire, cover attack REM advance with smoke, establish a strong repeater presence. Once I feel like I've got that working well in most missions against most opponents (I don't need to win, just get handy at dealing with most situations), I'll probably see about how swapping around some optional components can tighten up my game. Introduce some long range pieces, backfield harassment, etc.
All my PanO lists have a least one Nisse and usually 2 Fusiliers. All my Corregidor or Nomad ones have Morans. I change everything else around because I'm fickle when it comes to list building. I rarely find myself playing one list more than twice, even if there's only minor changes between them.
It's hard not to take an Intruder Sniper and Jaguars if they're available. Morlocks, Zeros, Hecklers and Morans are also almost always in there.
At what point are the units too similar? Including Zeros, Morans and Hecklers all at the same time seems like too much of a good thing, even if they are all mostly cheap.
Not the same role. Zero can be minelayer (defense) or hacker or FO, Moran are great area denial/hacking support (while still being specialist) and heckler can bring cheap rambo (Boarding/Emarat or red fury) or a stronger camo hacker than Zero (better WIP, BS and anti-HI/TAG mine). I often mix the three (and prowler).
I actually find they do different roles in many ways but in a sense they're a all excellent area control troops which is very much a Nomad strength and something they excel at. I don't think you'd be better served by three of one than one of each mind.
Yeah, those units actually have mechanics that interlace with one another. Koalas hit targets out of LoF, but can be avoided by Dodging. Jammer rolls unopposed vs Dodging models, but Camo or stealth can sneak past Jammer. Mines blow up on Camo and Stealth, but the mine needs LoF to trigger, so you bring Koalas to help cover areas mines can't... And so on. It's cyclical. Each mechanic overlaps to help provide a defense.
Bakunin: Zero KHD Zero Minelayer 2 x EM CCW Morlocks Corregidor: Bandit KHD Moran FO 2 x CR Jaguars Nomads: Puppetmaster Minelayer 2 x EM CCW Morlocks
Corregidor: 5 Man Wildcat Linkteam (they are cool) 2+ Jaguars 1-2 Moran FO 1 Reaktion Zond 1 Intruder Combined Army: 1 Q Drone 1 Dr Worm + Slaves Shasvastii: 1 Aswang 1-2 Q Drone 1-2 Ikadron 1 Dr Worm + Slaves