If it was my choice between the two it would be the Metz - more power than the Sunpack. The Sigma also has more power. But then I have just checked out Warehouse Express prices and the Metz and Nikon SB-800 are the same price, so given that it would be the SB-800.
The SB-800 still has two advantages over either of these units.
1) It comes with a Stofen type diffuser and these can also be bought as an accessory, but I have not found them for the Metz or Sunpack units. As I mentioned earlier I regard this as a must have accessory.
2) The option of at a later date aquiring an SB-800 or 600 and using wireless commander mode in i-TTL or manual.
Don
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