Best Niche to choose for Drop Shipping in 2018?

Hi,
I just place an order of $299 for a Custom Drop-ship Ali Express based store from a popular Vendor with everything setup. All I need to do is to tell them which niche should be selected out of a number of suggestions given by them.

Personally, I'm in digital marketing and not having that much experience in Drop shipping. Just taking it as an investment for recurring income. As I have always taken a lot from BlackHatWorld, I would like to know if someone can recommend me best…

Best Niche to choose for Drop Shipping in 2018?