Which legislature has the most power in holding the executive to account, the UK or the US?

When considering the power held by the legislature in both the UK and the US, it is essential to acknowledge the constitutional powers allocated to it in order to hold the executive to account. In addition to this, the changing nature of both legislatures must be taken into consideration in order to examine the powers that each exercise today. However, from the evidence that is available, it is possible to infer that the US still …

…account. This is evident through the constitutional powers allocated to it, and even though it's role has changed slightly, it still holds vital powers such as the ratification process, the Budget and Impoundment Act and the Committee system. The UK on the other hand is not as powerful as the US in holding the executive to account due to the there being no separation of powers, a strong whipping system, and conventions such as partisanship.