Welp, this is a question.

The answer will come down to how you define "strong".

Yes, Henry did basically start a new religion (Anglicanism) in his split with Rome, but one can easily ask if he would have been successful had it not been for a) the Reformation, and b) the skill of his advisors - yes, Thomas Cromwell.

Henry had a couple of minor military successes, but the biggest one, the one with actual serious consequences - Flodden - was, in fact, handled by his queen at the time - Katherine of Aragon.

And yes, it's true that being able to sentence someone to death at your whim takes a certain amount of power, but one can definitely argue that Henry did not use that power wisely - there is no question that any of his chancellors that succeeded Wolsey, More, and Cromwell were nearly as talented.

Henry was educated and smart beyond that, but he was also impulsive, obsessed with having a son, and had a short temper. He didn't just have to balance division in his kingdom like Edward VI, Mary I, and Elizabeth I (who no doubt was the most successful) but he caused a lot of it.

Henry VIII was a strong personality for sure. But a strong monarch? That's much more debatable.