Is the {nuq 'oH mI'lIj'e'} more "formal" than the {nuq mI'lIj} ?
I should have just answered both in the same email, but here we are. In my view point...
{nuq mI'lIj?} is incorrect grammatically, but generally accepted by most Klingons as a common informal way to ask.
{mI'lIj nuq?} is informal and grammatically formed, but sounds a little odd because the question word isn't at the beginning.
{nuq 'oH mI'lIj'e'?} is formal and grammatical - the proper way to ask, but maybe a little too proper for many situations.
{mI'lIj 'oH nuq'e'?} is grammatical but very odd - it's not really wrong, just very weird - a bit like "You were talking with whom?" instead of "Who were you talking with?"