Why is galvanisation considered better than tinning?

Explanation

Galvanisation and tinning are very common for checking rusting of iron. However, galvanisation is better than tinning. If we look at the activity series, the order in which these metals appear is: Zinc (Zn), Iron (Fe) and Tin (Sn).
Now, if some scratches appear on the surface of iron article, coating of zinc will be still effective because zinc will be corroded in preference to iron since it is placed above it. However, if same happens in case of tinning, then iron will be corroded in preference to tin because it is more reactive than tin. This means that corrosion will again start. Thus, galvanisation is always better than tinning.