Sephora vs. Ulta: The fall beauty sale showdown is on

New York Post Composite For the first time, Sephora and Ulta Beauty are turning fall’s biggest beauty sales into an all-out showdown— and the discounts are seriously hard to ignore. As a commerce reporter and beauty tester who has spent more than six years covering, testing and shopping the beauty space, I know which deals are actually worth your attention and which ones can be left in the cart. This time around, I’m rounding up the best Sephora and Ulta Beauty sales so you don’t have to, putting the biggest markdowns from both retailers head-to-head. In one corner, Ulta Beauty’s 21 Days of Beauty brings its rotating lineup of cult-favorite makeup and skincare down by as much as 50 percent. In the other, Sephora is firing back with its own one-day deals, putting coveted beauty staples on s