I hope that wasn't the exact phrasing of the question, because it is
unanswerable in that form. This is a problem in energy, i.e., physics,
and answers in physics almost always require quantities (*numbers*). So
a tidal wave (volume) is more destructive than a pressure washer, but a
hydraulic-mining jet is more destructive than a river.

You need the how-fast and the how-much numbers of each to compare. Or
relative numbers. E.g., "Which is more destructive: doubling the volume
or doubling the speed?"

Hmmm ... you need more than how-much and how-fast. You need
"concentration". A tidal wave 10 miles wide and 3 feet high is not the
same as one 1 mile wide and 30 feet high (each moving the same speed).
But, it's still a matter of numbers.

Bob