India

Here is a list of some colleges or universities offering B.Tech in Bio Technology in Tamil Nadu:
A.R.J. College of Engineering and Technology, Mannargudi, Tiruvarur
Aarupadai Veedu Institute of Technology, Chennai
Adhiyamaan College of Engineering, Hosur, Krishnagiri
Arulmigu Meenakshi Amman College of Engineering, Cheyyar, Tiruvanamalai
Arunai Engineering College, Mathur, Tiruvanamalai
Bannari Amman Institute of Technology, Sathyamangalam, Erode
Dr. MGR University (Dr. M.G.R. Educational and Research Insitute), Chennai
Government College of Technology, Coimbatore
Jeppiaar Engineering College, Sholinganallur, Chennai
K.S. Rangasamy College of Technology, Namakkal
Kalasalingam University, Virudhunagar
Kamaraj College of Engineering and Technology, Madurai
Karpaga Vinayaga College of Engineering and Technology, Kanchipuram
Karunya University (Karunya Institute of Technology), Coimbatore
Kumaraguru College of Technology, Coimbatore
Madha Engineering College, Chennai
National Institute of Technology, Trichy
P.S.R. Engineering College, Sivakasi, Virudhunagar
Paventhar Bharathidasan College of Engineering and Technology, Trichy
Prathyusha Institute of Technology and Management, Tiruvallur
PRIST University (P.R. Engineering College), Thanjavur
Rajalakshmi Engineering College, Sriperambudur, Kanchipuram
SASTRA University, Thanjavur
Sathyabama University, Chennai
Shri Andal Alagar College of Engineering, Kanchipuram
Sri Nandhanam College of Engineering and Technology, Vellore
Sri Venkateswara College of Engineering, Sriperambudur, Kanchipuram
St. Joseph's College of Engineering, Kanchipuram
St. Michael College of Engineering and Technology, Sivagangai
Udaya School of Engineering, KanyakumariAnna University campuses
Vel Tech High Tech Dr. Rangarajan Dr.Sakunthala Engineering College, Chennai
Vinayaka Mission's Kirupanada Variyar Engineering College, Salem
VIT University (Vellore Institute of Technology), Vellore
Vivekanadha College of Engineering for Women, Tiruchengode, Namakkal

Hello,
It really depends on where do you see yourself in next 5 to 10 years. If you are really bright & in top 1 percentile in India, you must stick to top B-Schools in India & you would be placed if you would be performing similarly high in academics. The kind of salaries versus expenditures in India is too pro-Indian thus for a skilled cream layer of India, opportunities are ever increasing, so is staying close to family, earning decent money & maintaining a high standard of living, if gives you work satisfaction in India, degree/education is worth.
On the other hand, as it's the era of globalization & the world is technically getting closer for which we need to have strong skills & networking which comes with pursuing a degree course abroad. MBA in foreign countries is all about "you" practically learning, exploring & contributing to your experience besides your peer group adding value to your skills. The western world has no dearth of opportunities for skilled people & can place you up and above the ladder. You may grow by leaps & bounds in less span of time & if you may be fortunate to balance between work & life, your family can enjoy your success with you.
However, answering your question, who will be preferred depends on who is hiring & what would be the task to be given. Of course, countries like USA, UK, Australia, Europe & Canada are the countries for higher education, but for the longer stay back & permanent residency, Australia & Canada will have an upper edge.