Both of the institutes you have mentioned, are one of the most preferred NIT's. Now from a job perspective, high salaries are more often in ECE than that of Chemical Engineering. Although, if you want to go abroad for jobs then in Chemical Engineering, there is quite some scope available.

From the trends available, the NIT Calicut offers quite a good placement in Chemical Engineering. The placement percentage is around 83% and the min salary offered is Rs. 4LPA where as the maximum salary offered is around Rs. 30 LPA. The average salaries offered was Rs 8.1LPA.

Now the placements in NIT AP are not that good of NIT Calicut. The college offers the average package of Rs. 5LPA which is quite low compared to that of NIT calicut. So from the perspective of job exposure and placement rates, I would recommend you to go for the NIT Calicut.

To know more about NIT Calicut visit the link below:

https://www.careers360.com/university/national-institute-of-technology-calicut

To know more about NIT AP visit the link below:

https://www.careers360.com/university/national-institute-of-technology-andhra-pradesh

To know more about Chemical Engineering, visit the link below:

https://www.careers360.com/courses/chemical-engineering-course

To know more about ECE visit the link below:

https://www.careers360.com/courses/electronics-and-communication-engineering-course

I hope this answer helps. All the very best for your future endeavors!