256GB data hoarder? I recently transferred more than 3TB of data across my network (moved my media library from one machine to another). I have a 1Gb network, took about 4.5 hours or so.
Network would be my first choice since you only need to do the operation once. If you use an external drive or a thumb drive you have to do the operation twice, copy from PC 1 to external drive, then copy from external drive to PC 2. The advantage to using the external drive method is that the external drive can then act as a backup of the data.
