If you allow 3rd party units, the unit I prefer is probably one of my own units. I think it's my
BriDoDon117b7, a
pink pellet spewing, bright green, data fetching Tank, with destroyable turret, toggable damage inversion device using technology derived from tro research, with a toggable overload-prevention safety, and a signed 10 digit display able to read and even write whatever variable I thought about, commandable from an in-game in-unit Graphic User Interface, horizontally stabilised and with help popups popping up if user doesn't know how to use it, and with the addition of a unit tracker and Wormhole Generator able to do automatic map-wide group teleportation. See the second post in that thread for the details. It's too bad it doesn't work in Spring.
However, I also like the complex transformation I scripted for RobotechUnit on his
RobotechUnit model. It has three modes, over water, over land not attacking, over land attacking. Here's it in action:
The Jedi force trick I scripted also sometimes even amaze myself:

It's undoubtely my favourite weapon, if a weaponless script can be called a weapon. But the unit it's mounted on is unfinished, and chance that it gets finishes and keep that script are very slim. I should this on another unit, and fix a few things like the horrible lag and friend-or-foe detection sometimes.
The
Return_of_the_OMGSuperKrogoth_2.0_now_with_blackhole.ufo use a similar weapon, but without the pretty animation, so it's not as funny. Nevertheless, I'm confident in the
Return_of_the_OMGSuperKrogoth_2.0_now_with_blackhole.ufo being the very best 3rd party unit, however, "best" only in the sense "most powerful". Because it's
also one of the most unbalanced! And a pretty ugly model hack, not a genuine complete polished 3rd party units. It can be fun when the AI starts producing them, because then even if I can counter with my own, the result leaves the maps devasted and void of any mobile units. On another hand, it's not funny at all when the AI decide to build one and I have to resort to the extremities of using mine to counter. Yes, it's more powerful than
that,
that or
that!
Some of my 2D units, like the
Naked Santa,
the latex, and the
Silly Tipping Over Rocket Man, are also much refreshing in a 3rd party scene dominated by Krogoth-like and TA-style units. Well, maybe "refreshing" is not the proper word for what await those who clicks those links.
All my special transport units I find very sleek too. Again, I haven't made the models, but seeing Under's C-130 drop paratroopers, or seeing SWTA LAAT automatically grab troops in range, or seeing units automatically disappear and reappear in circle of hellfire, is a joy.
But my favourite unit could also very much end up to be the yet-to-be-released latest TMU units. On a Legion model, I scripted a nice walk script where more or less everything move, I made the head turn toward the nearest enemy in a -90° +90° fov, and do a "no" sign if no enemy found, with a return to straight position after a random delay, and made 1/5 of them spawn as sergeant, which aren't able to fire, but can open teleportation vortex that only that unit can use, with no crash and nice decomposition and recomposition animation.
In case I was supposed to talk about units not made by me (because by now I think I pimped most of them), then please refer to paragraph eight and beyond of section 6 of what's my usual TAU sig:
http://www.tauniverse.com/forum/showthr ... post435292
It's about
Final Frontier, which I like because it's fun to blast regular TA units with giant spaceship with shadows that dwarfs even Krogoth, about
Imperial Authority, which I like because it has some of the most realistic model (yes, I mean the tie-fighter and a-wings and stuff are just like the real ones.), about
WarHammer 40k TA which I like for being very playable and self-sufficient and nice looking, about
TA:Dark Sun and its campaign, and about some other well or not so well known mods.
