Which AI model is best for image generation?

I'm curious, which AI model stands out as the premier choice for image generation? There's a myriad of options available, from GANs to Diffusion Models, each with its unique strengths and applications. Are there specific factors to consider, such as the complexity of the images, the desired level of realism, or the speed of generation? Additionally, do certain models excel in particular niches, like portraiture or landscape generation? As a finance professional dabbling in cryptocurrency and AI, I'm intrigued to know which model could potentially revolutionize the field, both in terms of artistic expression and potential commercial applications.