I have seen Downloading Subarea vs Clipping Images to AOI using Planet API? and I still do not feel satisfied with the answer so raise this again.
So what is really the difference between them? @bosth in their answer said
An important distinction is that the Clip API will be decomissioned in favour of other means of downloading parts of images, but the documentation is still there for existing users to reference. Currently, it is recommended that new users employ the subarea method.
I think the difference is Clip to AOI clip right at the server side, at the API endpoint https://api.planet.com/compute/ops/clips/v1/ and you not only download small size image but also pay for small size footprint/area why with the Subarea you pay for the whole scene footprint/area of 220km2 even if you clip only 1km2 out and download. In my case, when I activate the scene, get the download link, pass it to VSICURL and use gdal.warp() Planet actually calculate the area of whole scene and accumulate in my Used Area. The only thing good with Subarea is that you download the small size image which is faster, low bandwidth and reduce your local storage.
And if Clip API will be decommissioned (or has already!) then the only way to clip and download is Subarea, which seems not to save your Km2 quota.
Does anyone know the correct answer/explanation for this case?