Thanks for the question 

Comedk is a Consortium of medical and engineering colleges, having some of the india's best private colleges.

Wbjee is an examination for admissions in engineering college in west bengal. 

Comedk has better faculty, infrastructure and academically sound atmosphere. 

The fees of comedk colleges are high as compared to West bengal. 

Comedk colleges- RV College of Engineering, Bangalore

Ramaiah Institute of Technology, Bangalore

Wbjee-Indian Institute of Engineering Science and Technology Shibpur

Heritage Institute of Technology, Kolkata

However the choice depends solely on the person who has to do it. 

All the best