@IH82BL8 you can use anything you like for a faucet. Brass is good, bronze is better, stainless steel is likely brass in side, nickel chrome and plastic with brass insides can be used. All of them, or at the least parts of them, will corrode eventually on the boat. You might find RV ones serviceable or the Big Box store brands functional.
Just know that water on a cruising boat is like gold in the bank. Some fancy faucets will give you a gusher on your hands and down the drain, while emptying your tanks. This can be vexing as you start out onto a 3 day cruise with little or no water on day 2 and 3.
It is more a question of which design you fancy, how miserly the faucet is to use, and what you want to pay.