What's the difference between using vector-based and raster-based comic book bubbles?

Vector-based bubbles (like those on Comic Bubbles) are scalable without losing quality, making them ideal for printing at various sizes. Raster-based bubbles (like those found in some image editing software) are pixel-based and can become blurry when enlarged. For comic book layouts, vector bubbles are generally preferred for their sharpness and flexibility.