In my opinion it purely depends on your choice. If you have good knowledge of cmos design, analog electronics, IC design, digital electronics you can peruse both the courses. IIT DELHI and IIT KHARAGPUR both are among premier institutions for doing mtech. The placements is very good in both the branches. 15-20lpa is the avg package offered. As far of my knowledge what I knew from a senior that 8 of 20 students in iit kharagpur vlsi got placed in INTEL, some in Texas Instruments, some in Cypress, analog devices etc. Both the branches have ample opportunities in future for doing higher studies.