A system where the Executive and Legislature balance and check each other is -all things being equal- better than one in which their powers are combined.
You left out Judicial Branch as a Co-Equal
Using the US as a basis for your opinion
US could have had a coup during the vote certification in Jan 21
BI-Partisan politics in the US left years ago
UK does not have a Constitution based upon 1 single document
The UK constitution is an uncodified constitution, meaning it's not contained in a single document but rather a collection of various sources like statutes, judicial precedents, conventions, and treaties. This system allows for flexibility and change as it's not formally entrenched. The British monarchy is a constitutional monarchy, with the monarch serving as Head of State while the elected Parliament has the power to make and pass laws
And a House of Lords which at 1 time was mainly hereditary and that has mostly changed to a PMs appointment
The small numbers of Hereditary Peers are close to ending
Canada added the Charter of Rights in 82
It includes a Not Withstanding Clause where the Provinces can refuse the SCOCs decisions that Provinces can use but only for specific Clauses
Our Senate is unelected with retirement at age 75. Same for SCOC.
Both countries achieved Independence in different ways, US thru War of Independence and Canada thru negotiations.
IMHO that was the imetus where our differences between the 2 countries began
The birth of seeking a consensus in Canada IMHO began after GB conquered Quebec in 1759
Prior to that the conquering country expelled the losers who were civilians.
Which is what happened in 1758 with the capture of Fort Louisbourg
Yet 1 year later GB changed that with the capture of Quebec
Many rights were granted to the French civilians
Britain captured Quebec in 1759 during the Seven Years' War (also known as the French and Indian War) after defeating French forces at the Battle of Quebec. This victory, led by General James Wolfe, was a crucial turning point, leading to the British conquest of Canada and the subsequent Treaty of Paris in 1763, which formally ceded New France to Great Britain.
Americans and Canadians look at things with a differing lense
Note I am not attacking the US but can only go by what I see and know
US is a great country and we will see how that is in during the next 3 years and 3 months or so
Myself I go with the Westminister Parliamentary system