Bell peppers are larger in size, mildly sweet, and typically come in green, red, orange, and yellow. They're great when sliced and used in salads, pastas and for making stuffed bell pepper recipes. On the other hand, sweet peppers are much smaller in size hence the term mini sweet peppers and taste much sweeter than regular bell peppers. Similar to bell peppers, sweet peppers also come in orange, yellow, and red. Both types of peppers are great sauteed or grilled and only require a short cooking time.