What is the placement scenario at the Nirma University for electrical engineers? Should I prefer it over SRM computer science?

Electrical and Computer science is very different from each other and they have very few things similar to each other. 

• In electrical engineering, the course module includes a lot of physics and classical and applied maths, but in computer science, the course module includes discrete and applied maths and there is no part of physics. 
• In electrical engineering, there are a lot of theoretical studies of maths and physics but in computer science, there are mostly logical studies and coding. Although at the advanced level, these two branches do marge a bit, they are completely different for beginners. 

Here’s a brief overview of the two courses mentioned in the question. 

So, you should choose the branch according to your skills and knowledge, rather than choosing a branch, based only on placements. Otherwise, you may have to opt for branch change after 1st year.