Best Styling Product for Thick, Naturally Wavy Hair (Normal to Semi-Coarse Texture)

[Hayleyko]

I have very thick, brown hair with some natural wave in it. Prone to dryness. Texture-wise, it is semi-coarse. It holds curl easily and gets BIG in humidity. 

I am getting my hair cut shoulder-length, with a fair amount of layers. I'm pretty low-maintenance, so I would plan to style it wavy be either (a) using a diffuser or (b) letting it air dry. While I want to encourage wave, I am really worried about avoiding the "triangle effect" (which my hair is definitely prone to!). 

What styling products are best for preventing frizz, but creating some definition and separation when I diffuse or air dry? People have alternately suggested that I use mousse, cream, or a gloss - so confusing! I am also open to using a combination of styling products (i.e. spraying with a leave-in conditioner and then using a styling product). 

Please help!!

[TrysBeautyItems]

Ouidad heat and humidity line. For one product, it's the gel. There is, or used to be, a trial kit of this line..other places sell this brand as well. Edit: Ulta has the trial kit.

I have thick curls, and have used that in a high humidity environment, it does work, keeps everything in place and tames.