Be Verbose
Say everything you can about your image details
The example above demonstrates. Short description vs verbose description. With the case of the Nano Banana - the 'grey and black German Shepard' words confuse the generator and produces near Grayscale results with slight colors in the children in the rear of produced image. But all other features were well defined. This image was reduced in pixels, though not upscaled in resolution.
Again this varies with the generator model used. A verbose complex image can take 5 to10 minutes or more. This is the server on the other end of the AI & model you chose.
From my experience there is no one best. They all have their high points as well as low points. The AI with the best, most and unique features, may run through your wallet faster than a thirsty person coming out of the desert. [Credits vs generation time]
What might be low credits on one generator may not produce the desired results. Though you can create on one, and upscale or reuse image in another, this is one way to save, then it becomes time consuming juggling generators.
I do not favor annual contracts due to fact that things are still in flux and may change, and being bound to another that does not. Some tools are in various generators.
For starters in image and video generators.
OpenArt.AI Huge.com Higgsfield, Meta, CoPilot and lots of others. Consider this. If it is a companies core business, it will be better. If it is a sideline add-in or trendy idea, it will only be fair and basic, in my opinion as they are spread thin in the ability to simply focus on one product. Meta has Facebook, Glasses and all the other apps. Same with Microsoft. Higgsfield has Higgsfield
Initially diving in, I used the same exact from prompt Google Bard, and went over to Discord/Midjourney and the difference was astounding. [Here]
Examples
SeeDance
Create an image of a dog jumping over a fence.
Nano Banana Pro
Create an image of a black and grey German Shepard jumping over a white picket fence. The neatly trimmed yard is in a suburban neighborhood with medium sized homes lined in a well maintained neighborhood, with children playing on the sidewalks.