Personally? I'd use the partition, it will be a LOT quicker. Obviously the DVD's are good for backup's if the drive failed, but if your restoring, then obviously that hasn't happened.
It's been a while since I used Windows default imaging, I've switched over to Acronis, but if I remember rightly, it automatically figures out where it's supposed to go for you based on drive sizes.
One thing to mention, the drive letter's it says it's going to restore WILL be wrong, I have no idea why, but WinRE seems to pick different drive letters to Windows, don't worry about it, it's going to the right place