Though Nickel plated Brass and Stainless steel looks similar,they are different in below items:

Stainless steel and Nickel plated brass difference:
1) Stainless steel includes SS304 and SS316,Nickle plated brass is Brass with nickle coating.
1) Price: Stainless steel price is higher than Nickel plated Brass.  Nickel plated Brass price is a little higher than Brass.
2) Appearance/Color,see below TOFINE motorized ball valves with Nickle plated Brass and Stainless steel.

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