Five ways into a clip, sorted by what you already have: a sentence, a picture, two frames, a character, or footage you shot yourself. Every one of them runs the same roster of models, so you can try a shot cheaply and re-run the one that works on a better model.
Sorted by what you already have, rather than by what the tool is called.
Pick per shot, not per subscription: Veo when you need sound, Grok when you are still testing, Kling and Seedance when the motion has to hold up.
Describe a scene or upload a picture. One to three minutes later the clip is on your canvas.