The Mazzer Philos brings commercial durability to the home, but the boutique Zerno Z1 uses blind-burr technology to push the limits of grind precision. While the Philos is easier to buy, the Z1 wins on flavor clarity and sweetness. Is the Italian giant's first single-doser enough to beat the precision of a startup, or does the year-long waitlist for the Zerno actually pay off in the cup?