It's tough (and kind of pointless) to cut a bad tomato well.
Any job worth doing is worth doing with a nice piece of produce, so begin your sauce, garnish, pico de gallo or burger topper by choosing carefully.
Contrary to popular belief, color is not the best way to pick a tomato. Yes, you want one in a deep hue, but there are other factors to consider. A good tomato is free of bruises and dark spots; it feels heavy and firm but still tender, and it smells like a tomato. If it doesn't, it's not ripe enough.
Tip No. 2: With the right fruit in hand, reach for the right tool.