Yes actually because there are so many colleges available for engineering. Even the seats go wasted in many of the engineering colleges. Medical has limited seats. So the students at times are option less ie they cannot get admission into any medical college itself. So they think of drop. 

And also Engineering your gap gets spotted on at the time of interview for jobs which can prove problematic of you being recruited. 

At the end of the day, it's your personal choice that matters. If you want to get into best of engineering colleges like IIT, or some best government colleges then you can opt for drop also. It's up-to you that's what my thought is!