Hello Aspirant,
See both colleges are good one if you have to choose one of them so I would prefer to go for RCC Institute of Technology because this the government one and if you are getting government college with similar or little less facilities as compare to private then you should always go for Government college.
Both colleges are affiliated to same University and as you want to pursue ECE so you might have to work hard to get placed from any of the above colleges because the companies which come in the above colleges for placement drives, they usually take more students from CSE so if you work hard and develop those skill then you can also be there.
Hence I would prefer you to go with government college. But the ultimate choice should be yours. Note that the above conclusion is made on the basis of reviews of students who have studied or studying in the above colleges. If you want to read that reviews refer to the link given below :-
https://www.careers360.com/colleges/rcc-institute-of-information-technology-beliaghata
https://www.careers360.com/colleges/st-thomas-college-of-engineering-and-technology-kolkata#review
I hope this information helps you.
Good Luck!!
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