There is no ‘best’ hostel because every student considers his own hostel better than others because it's the place he spent the best years of his life and gave him precious memories. Also, NIT Rourkela does not have hostels but Halls of Residence. That being said, my sister, an ex-student of NIT Rourkela considered her hall, Kiran Mazumdar Shaw Hall of Residence the best hall in NIT Rourkela.
Overall, KMS is the best hall of residence in NIT Rourkela that offers a peaceful and serene experience.