can any one one give an idea that which new IITs are good for CS/ece. why cut of new hyderabd IIT was higher then that of established one like BHU-IT ( conferred full IIT).

You are under a misconception. IIT-BHU (then IT-BHU) CSE closed before IIT H CSE.

IT BHU (now IIT BHU) CSE : 1548 to 2509

IIT H CSE : 1813 to 2562

So cllearly cut off was higher for IIT BHU even wen it was not an IIT.

All new IITs are equal with their own benefits and shortcomings. By joining IIT BHU CSE you may have the gud points of both old and new IIT. New IIT have not got their infra ready as yet. so it is advisable any of K,KGP,M,D,B,R,G,BHU.