Best Practice Transition from Older iPad
I’ve also had many issues with Quick Transfer. I’ve found that iCloud or Mac transfer works just as well. Could you try iCloud backup & restore? I heard they were giving unlimited storage if you are trying to restore via iCloud. If that doesn’t work or you’d prefer not to upload and download a few GB, take a backup to your Mac and restore it to the new iPad. I would NOT recommend starting from scratch unless you feel that your current iPad is cluttered and you WANT to start from scratch. Starting from scratch is almost never necessary on a fully functional (old) iPad.