Hey,

The both of the entrance exams are good and the colleges or universities which you will get after the entrance  are great and they can't be compared as they both are good in their own way but still, if you are trying for bachelors I recommend focus more on NID as UCEED is new to BACHELOR course it is just started in 2015 but NID has senior and experienced faculties which can train you best for B.DES, NID in terms of Bachelors is far more better than IIT (UCEED) .

All the Best !!