Kling 4.0 vs Seedance 2.5: How to Choose for Commercial Video

Kling 4.0 vs Seedance 2.5 for ads, e-commerce, and short drama: what Seedance 2.5 and the current Kling lineup verifiably offer today, what Kling 4.0 is reported to add, and how to run a fair test on launch day.