Pacing and variance
The second game concentrated its high-variance moments early. The third distributes them, which produces a flatter but more sustained curve. Neither is objectively better; they suit different session lengths.
Presentation and accessibility
The third game wins clearly here: higher tile contrast, built-in reduced motion, and a clearer settings menu. If you play primarily on a phone, that alone justifies the move.
FAQ
Which is better for short sessions?
Mahjong Ways 2, because its high-variance moments arrive earlier. The third rewards longer sittings.