However, if you just want to be an instructor/lecturer, a masters degree will suffice.
Do you just want to teach or do you also want to pursue research and acquire grants for your university? A professor needs to publish multiple papers and continue research, besides teaching.
In India, you can become a lecturer/instructor with a Post Graduate Diploma/Masters degree if you just want to teach.
You definitely should be choosing which college you want to attend after examining how the major of your interest is ranked nationally. Schools with big names and a huge reputation does not always mean everything when it comes to specific fields. So take some time to examine your options and think about what college will truly benefit your future career. Each department within a university has dedicated webpages filled with information on their studies, so make sure to check them out!