Yes, DATA DVD. You can only put 4.38 GBs of clips on the 4.7 disc. (or less) If he can edit your footage, as is, that's all you gotta do. May take a few discs for lots of footage.
Drag & Drop into Nero, or what ever and burn DATA DVD.
Drag & Drop from disc, back to a computer to edit.
You could also loan or borrow a USB drive to do the transfer to your client. That would save burning lots of DVDs. (Thumb drives would not be suitable because of file length restrictions of the file system used.)
My TV and Network Player have USB ports. The TV may not work with NTFS (haven't tried), whereas with the Network Player I know it would be read only. No doubt other devices exist which do not fully support NTFS as well.
On the other hand, if you want an NTFS thumb drive to use with NTFS systems, there's no reason *not* to do it. Personally, i don't own even one device that couldn't use an NTFS thumb drive so there's no reason for me to worry about backward compatibility.