Honestly speaking, unless youre interested in Public Research Organizations like ISRO, DRDO or pursing a PhD in Future, RF & Microwave Branch has low placements across IITs, when compared to VLSI & Embedded Systems Branch. Incase you have fair chances of securing a seat at some of the Top 3-5NITs, you might just opt for them. VLSI Branch at NITs like NITT, Karnataka, Calicut, Rourkela, Nagpur, Warangal have really good placements.