Style is readability
White or yellow text with a dark shadow still wins because it works on any background. A thin font in your brand purple looks designed and fails on a beach clip. Keep two lines max. Highlight the one word that carries the joke or the step, not every word in a rainbow.
Pick a style and keep it for the series. People should recognize your captions the way they recognize your voice. Changing the font every video is a rebrand nobody asked for.