There are several AI image generators available, each with its own strengths and weaknesses. Here are some of the best AI image generators according to the search results:

1. DALL·E 3: This AI image generator is known for its ease of use and can quickly generate high-quality images.

2. Midjourney: This AI image generator is known for producing photorealistic images and is ideal for image upscaling.

3. DreamStudio (Stable Diffusion): This AI image generator is known for its customization and control of AI images.

4. Firefly (Photoshop): This AI image generator is known for integrating AI-generated images into photos.

5. Generative AI by Getty Images: This AI image generator is known for its ability to generate images for commercial use.

6. Visme: This AI image generator is ideal for graphic designers, hobbyists, and artists who seek to transform any image into geometric representations for an innovative, unique output.

7. Craiyon: This AI image generator is best for entertainment purposes and is free and unlimited.

It is important to note that the "best" AI image generator depends on the users specific needs. For example, if you are a professional using AI image generation for your business, you may need a tool like Midjourney which delivers consistent, reliable, quality output. On the other hand, if you just want to play with AI art generating for entertainment purposes, Craiyon might be the best option because its free and unlimited.