I agree with wabbit. Your question is very unclear. Neither black holes nor worm holes are measured by 'strength' or by 'how powerful' they are. You can use these terms, but only in very specific contexts, such as stating the strength of the gravitational force at a given distance from the black hole. But overall we don't usually say one black hole is stronger than another. The same applies for worm holes.
Also, PF is not an encyclopedia. Broad questions, such as asking what the differences between a black hole and a worm hole are, are better left to other sources. What can one post or even one thread hope to say that beats a single, well-written article? If you read an article and then have specific questions, then that is something we can help you with.