Both Zoology and Botany are good for Masters. Both of these subjects offers good career prospects. You should choose one among these based on your interests. 

Job roles available for M.Sc Zoology students - 

• Assistant Professor 
• Zoology Teacher
• Zoologist
• Junior Research Associate
• Wildlife Educator
• Naturalist
• Associate Editor Zoology
• Zookeeper 

The salary packages offered for these roles usually range from INR 3-5 LPA.

Some of the career paths available after doing an M.Sc in Botany are - 

• Associate Professor
• Research Associate
• Botanist
• Agriculturalist
• Pharmacologist
• Medical Coder

The salary packages for M.Sc Botany students are in the range of INR 4-9 LPA. 

For most universities, the syllabus for M.Sc Zoology and Botany is in English.