See you are giving a tough choice to select, NIT Calicut and NIT Allahabad . Both colleges are really good. NIT Calicut is having a good reputation but you can't ignore nit Allahabad .

But I would suggest you to go for nit Allahabad as placement are also good in comparison to Rourkela , in nit Rourkela you have attendance system very rigid when compared to that of nit Allahabad. 

But afterall it's your choice choose wisely. 

Thank you.