You may need different lengths of USB-C cable for each of your charging ... below will be fine as 20W should be enough to charge even an iPad. But if you are connecting to other devices or syncing ...

After I received the 29W adapter and the cable, I tried to charge my iPad Pro while I was using it and I noticed that it was way faster ... could there be a way to benchmark the 29W and 12W adapters ...

In 2018, it unveiled the new iPad Pro with a USB-C port instead ... It's just my iPhone-charging cable. Transferring large files to your iPhone isn't something every user needs.