Many beginners start with Arabica because it is usually smoother, more aromatic, and easier to approach for people who are still developing their taste for coffee. Arabica often highlights sweetness, acidity, and clearer flavor notes that feel more familiar to new drinkers.
That said, Robusta can also work for beginners who prefer a stronger, more intense cup or want higher caffeine. The better starting point depends on the person's taste preference, brewing style, and whether they enjoy a softer or more powerful coffee profile.