Hi there!
Before even knowing you're interested in testing out Bourjouis Foundations, I totally wanted to recommend their "Healthy Mix" foundation. I bought it recently and I'm absolutely in love with it.
It provides a good medium coverage, but feels very light on the skin and blends effortlessly. Revlon Colorstay and MAC Studio Fix Fluid have a much thicker consistency and are also harder to blend.
I'm also happy with their color range. They are quite yellow toned, so perfectly for an NC15 like you are. Look into the lightest or second light shade.
Also, Top-Make up artist Lisa Eldridge uses this foundation in her "No-Make up"-Look video. Look into it if you are interested.. She has great tips on conealing and foundation. (lisaeldridge.com)
My favourite concealer that provides good coverage, but feels light is L'Oreals Touche Magique. It is perfect for undereyes, but also for spots.
HTH!