Should I prefer for my Sister,LJ Computer or Nirma Electrical?

It depends upon your sisters choice because college doesnt matter for making a choice , it is totally about interest for the specific branch. Yeah now a days computer-it on the trends and more scope also available in future for this line but electrical also good one choice so that whatever you want to do after engineering , it does matter because after taking admission in any branch. You have to work with that core branch so its upto you.