Why ask about disc brakes when you already purchased your bike?
Just for your consolation, V-brakes are better on folding bikes but disc brakes are actually more efficient IF IT IS A HYDRAULIC ones. I say all disc brakes on folding bikes are mechanical, meaning they are still actuated by cable. Just like V-brakes, they are dependent on how heavy you pull the levers to stop. We are talking about cable brakes , OK

Now imagine the braking surface.
The V-brakes braking surface is 406 mm long on one revolution, that's a long surface while disc brakes is usually 6 inch or 180mm diameter only. That's a small surface. It's OK if it was hydraulically assisted, just finger touch and the force is strong but cable, hmm.................depends on how strong your fingers are. The advantage on disc though is, it works the same when wet while V-brakes you need to modulate first, meaning press , release, press release before it actually stops. Problem is folding bikes can't use hydraulic disc brakes because of the hose which cannot be folded much. Unless you don't fold your bike, that is........
Want a better V-brakes, can go for Shimano XT sets. It actually cost more than the mechanical disc brakes and even the lower end Shimano hydraulic disc brakes.

Just curious want to know.
I see. Thanks for the explanation. Tektro is considered a cheaopo v-brake? haha.