As i said in the other thread you did:
"Well there only is one real choice.. if you got a D2C Wii then you get the D2CKey.
If you got a D2A/B Wii you get a Wiikey(or some else chip that is for D2A/B)"
I could add that the D2CKey have like 30 wires to solder (there are coming other D2C chips that have less wires , more like 13 or so)
noone knows if the D2CKey is really updateable , you have to wait and see
Some have lost there trust to the Wiikey and gone over to Cyclops and such chips, but since then, the Wiikey team seems to have improved, and there should't be a problem now.