The correct comparison is: Both are rocky planets, but only Venus spins in the same direction that Earth does.
To elaborate:
- Both Venus and Mercury are indeed rocky planets.
- Venus rotates on its axis in the same direction as Earth (counterclockwise), while Mercury has a very slow and retrograde rotation, which is different from Earth.
- Mercury does not have a significant atmosphere, while Venus has a thick atmosphere.
- Venus is generally hotter than Mercury due to its thick atmosphere trapping heat, despite Mercury being closer to the Sun.
- Venus is larger than Mercury, contrary to the last statement.
So the most accurate comparison is about their rotation and that both are rocky planets.