On-device update vs iTune-connected update

In iOS 5, you have the choice to update iOS through wifi / 3G, instead of using connection with iTune   Between on-device update the software and using iTune to update, recommend using on-device update. 1. It is faster than iTune updates (quite out of estimation, in fact); because iTune updates deal with a lot other things 2. You can bring the device outside during updates. 3. no need to open another program: iTune in conclusion: handy & convenient