Midjourney produces the highest quality artistic images. DALL-E 3 is best for accuracy to text prompts. Adobe Firefly is best for commercial use as it's trained on licensed images.
Stable Diffusion is completely free and open-source. Canva AI and Leonardo AI have generous free plans. Midjourney requires a subscription from $10/month.
Midjourney (paid plans), Adobe Firefly and DALL-E 3 allow commercial use. Always check the specific tool's terms. Stable Diffusion images are generally free for commercial use.