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 maintains the most power in holding the executive to account, regardless of the change in role it has undergone.
With specific regard to the US legislature, its role has altered from the constitutional powers of law making, to the seemingly less powerful role of law scrutiniser. Although this may appear as if Congress has lost a significant amount of it's powers, this is not the case as Congress is still a very influential body with regard to legislation.…