Just for information's sake, there is no better or worse tool. All tools use the same 2 ways to reduce file size. Resolution scaling is one factor and image type/compression (Jpg/png) for images is the other. What changes are the default settings and the quality that each tool uses. So some set the compression rate to 20% some to 80% and so they seem like they offer greater compression but at the cost of inferior quality. The same happens with the resolution that can scale from 72 dpi for view, to 200-300 (or more) dpi for print, and so on. If every pdf tool uses the same settings, they will output the same size and that is because those are set by Adobe in order for PDFs to be able to be used by anyone and on any device.
Now some tools allow this to happen easier some harder, some can do it at one document per time some can do batch compression and that's the only thing that really matters.
At the request of the OP, the thread will close, and thank you all for helping out.
