I researched on both the colleges, and here is my answer to your query-
MNNIT Allahabad is far better then MNIT Jaipur for Electrical Engineering. MNNIT has better placements and academics for Electrical branch.
MNIT is situated in the middle of the city, so you can easily join coaching classes for GATE, ESE, and other competitive exams. But then, many students from MNNIT clear GATE, IES, Civil Services, etc. because of its academic friendly environment.
Both the colleges perform equally well in rankings.
I would recommend you join MNNIT Allahabad for your Electrical degree.
While both of these colleges offer good education, MNNIT Allahabad holds an edge over MNIT Jaipur. I have friends studying in both the colleges and their first-hand experiences clearly depict how better MNNIT Allahabad is.
Overall, it is highly recommended to choose MNNIT Allahabad over MNIT Jaipur any day. The better placement ratio, friendly and supportive faculty, etc, make it the perfect place for new engineering aspirants like you.