A DVD holds two hours of video and can be played on computers and home DVD players. Multiple tapes can be combined on a DVD, with table of contents for easy navigation.
A flash drive (USB) holds about 6 hours of video in the MP4 format. This will play on your computer, some "smart" TV sets, and on many digital phones.
A hard drive's capacity is limited only by its size. Files can be in the MP4 format or in the AVI format for easy editing. In the AVI format approximately 14 GB of storage is required for each hour of video.
Unfortunately Apples and PCs don't mix very well. Ours is a PC world. We cannot convert and download to hard drives that are formatted for Apple computers.