see if I consider the college as branches are the same . Then both are good college you can't really differentiate between them that which is better or which is worse. But obviously nit Calicut has a brand . Nit tag attracts more companies and also placements are good. Being a government college fees is also less than bits. More you will get a wonderful environment in nit Calicut. 

I suggest you to go for nit Calicut.