Adding numbers:
Not trying to get into this argument but...
1) Do either have a symetry modifier (and i'm not talking simple instance mirroring)? [Maya doesn't seem to]
2) Do either lock you on a object when your in subobject selection?[Maya doesn't seem to]
3) Do either have a unwrap UV where you break apart an object based on it's planar angle to another?
4) Can you manually view/copy and edit x/y/z locations view keyboard? [absolutely required for precision work]
5) Does truespace have a node/stack/history, I know blender and maya do.
6) How good is their greebling tools, if any? [The max plugin is kinda wonky at times]
Blender:
1) Yes - the mirror modifier can operate on multiple axes at once.
-> 2) Not quite sure what you mean here - lock you on an object in what way? view? editability? other operations?
3) Yes - smart projections does exactly that and fills the UV space as efficiently as it can with good tool flexibility.
4) Yes - the N key pops up the tranform properties dialogue, or you can enter numerical values for any tranformations as you perform them.
6) Yes - blender has an included autogreeble script called 'the discombobulator' which adds 'doodads' to things with full customisability. Eg:
City and
Death Star.
Truespace:
1) Yes...sorta. It can mirror model edits real time, but for things like UV maps and textures you must manually click 'update'. It won't auto apply when you export models either.
3) No - no UV mapping tools at all beyond cumbersome standard transformations.
4) Yes - object properties dialogue. Has a handy little feature where you can input simple math too, but it's problematic in that if used on object groups it won't affect the positions of lights, making FS hierarchy setups rely on manual rescaling.
5) No - it has an undo that works on some things but not others (it won't for example undo if you accidentally apply a UV projection to an entire mesh). There is no stack or node editor functionality.
6) Yes...kinda - no greebling tools exist in the program, but there is a plugin that can do limited greebles.
It's fairly inflexible, but it is there.