Which is has a stronger bonding. S-H---O or O-H----S?

The bond strength between S-H and O in the S-H---O interaction is generally weaker than that of O-H and S in the O-H----S interaction. This is because the O-H bond is a stronger polar covalent bond due to oxygen's higher electronegativity compared to sulfur. Additionally, hydrogen bonding, which can occur in O-H----S, typically involves stronger interactions than simple van der Waals forces present in S-H---O. Therefore, O-H----S exhibits stronger bonding overall.