which niches are hottest for selling plr products ... - most popular expensive skin care products in the world

I will launch a wso for PLR articles and members.
I would like to know which niche market is the most popular selling PLR products.
I mean, which buyers want to buy articles, reports or videos with PLR rights?
Weight loss, beauty, skin care, acne, depression, female health, Internet marketing, computers, etc.
Please provide your comments as they can help me save a lot of time and money.
I can avoid many trials. and-
Mistake and invest only in-demand niches.
Do you think there will be a lot of demand and buyers for such things?