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I did some test comparing the damage bonus from sneak attacks that some weapons and skills get in pve and pvp.
All the tests were made in cyrodiil with fixed stats like 1212 stamina and 155 weapon dmg, also all enemy players have the same armor 700.
As you can see partial bow attacks really do more damage than full charged attacks.
rapid conclusion: Bow ftw !!!
If you have any question about the test just ask