GameSpace has always handled .X objects better than TrueSpace for me. You'll run into problems with either program if you're doing more complex animations, as far as exporting the .X animation. TrueSpace 7 still doesn't address the .X problems that have burdened GameSpace for so long now.
You can, however, use a second program such as Fragmotion or Milkshape to create and export animations using GameSpace objects/characters in .X format. Its good to have Milkshape as a second program anyways, as it's a great file converter for many formats.
-Keith