This all seems kind of pointless. Considering everything in here is fiction, the results of the first two categories, sans personal bias, pretty much comes down to whichever universe had the creator with the most (for lack of a better description) childish imagination.
I could create a mech universe too. Lets try this out.
Each of the machines is two feet tall and supports armor made of the physical manifestation of the dreams of kittens shaped and forged using the primordial energy of the big bang inside a 100kg forge with zero volume, thus creating infinite gravitational compression. (If you don’t like this sentence you might want to skip to the end of the post right now

) Obviously, they are impervious to external damage.
For armaments, standard issue semiautomatic railguns launch clusters of sentient mechanical turtles to surround the target. These automatons then become intangible, penetrating through the target, and proceed to ingest all combat-related system using the matter to self-replicate. Once finished, they expel excess waste in the form of filet mignon to feed the homeless and proceed to deactivate themselves. Standard side arms include high capacity 10mm handguns imbued with the vengeful ghost of James Cheney (historical civil rights activist and, unfortunately, martyr).
Their maneuverability leaves much to be desired, however. Unfortunately precision and long distance teleportation through molecular disassembly (akin to Star Trek methods) was deemed inhumane and witchcraft by society, one of which is frowned upon. With alternative methods requiring devices too large to maintain the aesthetics and dress protocols of most military units, more conventional methods of near-light speed travel must suffice. To complement these speeds within each mech a small porous orangutan shaped creature is contained which devours all known sources of electron based energy when berated. This creature, combined with kinetic-to-electric energy converters and antiquated recordings of sub-intellectual adolescents partaking in long distance theme based competitions, is used to instantaneously halt the mech, regardless of speed, for rapid changes in direction.
The power source of these machines is of course the indomitable American Spirit.
And yes these machines are manned. Despite current trends, humans evolved to be very small.
---TLDR:
The point I am trying to get across is that anyone can create the most stupidly powerful warriors in any universe, but it does not matter. What really matters is what people like. No one would like the universe I thought up just now because it is, by design, preposterous. So really the only category which matters is the last.
In other words, This:
Monolith, on 05 July 2012 - 11:34 AM, said:
I think alot of the debate here is like a bunch of people arguing whose imaginary girlfriend is hottest.
In perspective, this really is a poll about preference.
Hope some of you enjoyed reading this wall of text as much as I enjoyed writing it. There was more but I think I have gone on too much already.
P.S. Yes this is my first post. For better or worse, I like to make an entrance I suppose. Glad to be here.
Edited by Highlander IIC, 08 July 2012 - 05:36 PM.