well It depends. I own a dominix v2 LE and an Dark Initiate v2 LE. Sure, the LE is shorter, but its lighter and quicker. If you want somthing small and quick, go with the Initiate size. If you want the reach, get a dominix. If you wanna be super awesome and suport ULTRA, buy them both!
True, you could go with both and have a nice saber/shoto duel wield combo
The Dominix is a good one, basic but very functional. Looks great with sinister colors like red, whereas the Aeon is pretty amazing in light side colors. My friend has a blue Aeon and it looks really good.