Rightly explained MBA or Mtech should not be selected on the basis of job opportunities it should be based on your skills and interestspardon me if this posts hurts anyone. But this is what I believe and I guess I ain't wrong too. M tech or mba or something else should never be decided on the basis of the fact that which one will fetch you more job opportunity. Its all about which job is more suitable according to your set of skills.
Someone with better technical aptitude should stick to mtech. While someone who is more of a people's man, loves being among humans and has excellent comm skills should go in for mba. What happens is that if you chose a stream without having proper aptitude for that stream , you end up in being the lower half of your class and end up with a poor job.
So my advice is always that join the stream you believe you can excel in. None remember the second best ever........