Is there any thing special with an axial tilt of roughly 25°?
Mars (the planet with an axial tilt closest to that of the Earth) has an axial tilt that varies greatly over time. For instance, 4 million years ago, the mean obliquity was $∼35 ± 10°$. From the same article:

Earth on the other hand has had its rotational features stabilized due to the effect of our large Moon.
So it is only by chance if the axial tilt of Mars is currently similar to that of Earth.