Is nickel plated water block better then full copper?

copper is better.

No. No matter how well nickel conducts heat, you are adding a layer. Now, it may not make a huge difference, but copper alone is better than copper plated with nickel as far as heat conduction.

you wont notice much of a difference... if you like the looks go for it, but in theory copper is a little better... the nickel plated block would be the preferred one though if you have any aluminum in the loop like a koolance radiator, the nickel prevents the copper from coming into contact with the aluminum trough the coolant, which would cause galvanic corrosion.

The nickel also prevents discoloration of the copper. It helps for looks.

they're about the same actually for 2 reasons

1 most copper blocks are coated so they dont corrode. Fuzion even tells you this. So results are simmilar to coating with nickel

2 If you dont coat it to prevent corrosion it obviously corrodes which reduces the performance

nickel plating should give you an excellent surface and not corrode any where near as fast as copper

Nickel is far better. For those that say nickel add a layer, you should see what a copper block looks like without proper maintenance. Corosion is also a layer and that's ultimately what you will get.
I have both the g92 copper and nickel and I want to coat the other copper one because it's a hassle to clean it.

Black Delrin is cheaper and not to bad on the eyes.