I have a guideline I like to follow when putting together my pizzas, I like something spicy, something savory, and something sweet
Spice: banana peppers, jalepenos, or yes, hot sauce if that's what I've got
Savory: bacon,chicken, pulled pork, sausage, pepperoni, mushrooms,
Sweet: onions, picked red onions, roasted corn, pineapple
You can blend stuff (put tandoori chicken on the pizza) for even more interesting combos!
I feel like one of each gives a great result.