over the years, i've found that it's best to have one device at home and one at work and to sync them.

i'm a Mac guy, so about 5 years ago I bought an iMac and a MBP. i synced them with iDisk.

nowadays, i find drop box quite useful.

in addition, to not having to commute with a device, you have your data in two physical places which protects against theft and mechanical failure. in addition, it's in the cloud which is great when traveling.