I like Campari. I like the heftier Negroni-adjacents (eg Commedia all'Italiana). For the Belafonte, though, I prefer a minor tweak to the recipe to rebalance the Campari to more of a supporting role. 35ml porto blanco, 25ml campari, 100ml tonic.

[Belafonte]

If you've been drinking Americanos or Bicicletas, you should also be drinking the Belafonte. Fruity from the white port, bitter (and great color) from the Campari - the tonic water ratio stretches the drink, diluting it more that the Americano or Bicicleta while preserving the central flavors. A great and low abv refresher!