The flavors and aroma of coffee are pretty much the same quality between the Lattissima Pro and One. But there are a few differences: 1) Lattissima Pro has more coffee options including a ristretto with an LCD display 2) Can heat milk by itself and froths more consistently. 3) Dispenses hot water. 4) Has a larger milk tank, water reservoir, and used pod container. 5) Priced higher. But the Lattissima One is slightly more compact and lighter and heats up faster.