Which is the best pen for UPSC Mains?

Used V7 for this year's mains. Had to be very careful while drinking water. 🤣

How come V5 is so popular. I found v7 much smoother. Initially the the pen seemed thick. But now my hand has adjusted. 

But definitely gonna try all these pens. 

Who doesn't love a box full of premium pens? 😂