I will leave it to each individual to decide what leading means for them. If you ask me today, I would say that MidJourney is clearly leading in terms of quality and setting the standards. It feels to me that everyone else is just trying to catch up. 

How will we decide which AI tool is leading?

I will start a poll with all options listed above 1 week before the end of the market (23.12.2024) and will resolve to the option with the highest number of votes. 

Yes, ChatGPT + Dall-E counts as Dall-E and any commercial text-to-image model released by OpenAI.