I would choose Syaoran's sword AND magic....like Takeru Yamamoto said, Syaoran can use magic without it...
Besides, the sword is just as good as the staff....you can still use cards with it...but you can use ofudas too. Plus you can cut down anyone in your way.
That said, keep in mind a few things about the staff and the sword:
1) The staff can transform into a sword, which powers is dictated by the will of the user. It has been shown to slice through solid rock!
2) The sword in theory can deflect the staff, though not for a prolonged period of time. It deflected The Sword and it can also hold of mystical attacks. The only way the staff can do that is to use The Shield.
3) Syaoran's sword can be used as a regular weapon, where as Sakura's staff MUST be activated from its form as a key.
4) Again, in theory, the staff can NOT be broken. Its mystical properties will not allow it to be broken into pieces (as I wrote in my fanfic story 'Arcademan: In the Cards...' when a villain tried to bend and break it only to have a backlash of magick smithe the villain). The sword, with its mystical properties may have the same thing but if it ran out of magick, it would most likely become another metal sword unless the metal itself was forged by magick.
Heh...just adding more fuel to the fire