In what Ways and why Are the Committees of the US Congress so Much More Powerful than the Committees of the House of Commons?

One of the first and most obvious differences is that the committees in congress have the ability to stop a proposed bill before it has even reached the floor of the reps or the senate. This shows immense power as effectively the committees in congress have more power than individual senators or representatives themselves.
To further emphasize this point one only has to consider that in 1996, 6,808 bills were proposed and only 337 of them were implemented. This is quite a contrast as it is much easier for a bill to be passed in England, even with the oversight of the house of lords due to the massive majority being enjoyed by the Labour party at the moment. However congress can re-introduce a bill if it has been amended, although once again it has to go through the lottery of the committees.
This is also quite the opposite of committees in the house of commons as these committees don't even get to be involved if a bill is considered to be of constitutional importance as these sorts of bills are debated on the floor of the commons. The most a standing committee can do is amend a bill after its second reading in the house of commons. …