Kling v3 Pro from a node on your own fal.ai key, at $0.112 a second. Wire a still into it, branch the takes, and rerun the graph next brief.
$0.112 a second with audio off, $0.168 with it on. You pay the provider; Flowgen adds nothing.
Your fal.ai key, or Higgsfield for the 2.6 generation.
A prompt, and a still to animate if you have one.
Physical motion that does not fall apart. Hands, cloth, liquid and anything with weight survive better here than on most of the list, which is why it keeps turning up in product work.
The 4K variant is $0.42 a second, near four times Pro, for a resolution most feeds will recompress anyway.
The Short drama template already wires it up.