There is no best faucet in general.

There is no go-to alternative to the Karbon.

Moving on to a new faucet is probably the best decision, so, good instincts there.

Do you want an articulating faucet? My guess is you want something modern looking if you are replacing the Karbon. You are going to have to do your research and figure this out for yourself. StarCraft Custom Builders has one of the most valuable web sites for faucets and everything else, and I recommend you start there. The way I have done this (it’s a lot to process) is to first choose the companies you are willing to buy from, then check out their options.

Waterstone has the Hunley articulated faucet that comes with a side spray, and a few others. California Faucet and Rubinet only have articulated pot fillers. In2Aqua has nothing you want to see, same with Jaclo. That leaves you with the Waterstone options, Brizio (bottom image), and whatever you can find at Moen or Kohler. Best of luck.