The Valour and the Horror

Superior organization and experience alone, however, did not explain Germany's ability to wage armoured warfare on equal terms against a coalition of industrially superior powers from early 1942 until late 1944. 

The quality of German armour also counted significantly in the balance. German armoured vehicles were, with one or two exceptions, significantly better than their equivalent in the opposing armies. British armour in particular was lamentably inferior to the German products...."they [British] did not succeed in building an effective tank in the Second World War. That crucial balance between firepower, protection and mobility which underlies successful tank design eluded them." The Second World War, John Keegan, p.399. 

BRITISH: 

Mark I

Rommel found, in North Africa, that he could destroy them only with his 88 MM guns. The tank was strong but almost immobile.

Churchill 

It was as strong as the Mark I but not much faster.

Cromwell 

Introduced in 1944, it had speed and protection but its gun was inadequate. 

Firefly  

It wasn't a tank but a 17 pound anti-tank gun fitted to a modified Sherman. It provided the British with their main weapon against German heavy armour, in 1944-45.  

AMERICAN: 

Sherman 

It was fast, reliable, and easily maintained but it brewed up easily (Ronson's) and lacked sufficient fire power. The great merit of the Sherman was that America could produce massive quantities of them. It was also the Canadians main battle tank.

Russian :

T-34 

Much of its technology was developed from American prototypes, developed by Walter Christie. To the chassis and suspension the Russian added an all season engine and potent gun. 

German: 

Mark III

It lacked the ability to fire its gun in any direction except that which the tank was pointing; but it was inexpensive to produce and had a low profile. Its design was widely copied by the Russians, Americans and British. 

Panzer IV

The German army's mainstay. It had been steadily improved since 1939. When it was equipped with a long 75mm gun, it almost equalled the Russian T-34.

Tiger II  

With its 88 mm gun and 40 mm armour it was superior, in fixed if not mobile situations, to every other tank. It moved slowly due to its size and its turret traversed slowly.
 

Even with air superiority and tank killers like the Firefly, the German tanks were far superior to anything the Allies had and enjoyed a kill ratio of 10:1.  

In 1943-44 the US produced 47,000 tanks. Germany produced 29,600 tanks and assault guns. Britain produced only 5,000 tanks in 1944. Because of this the British depended on the American Sherman as their main battle tank. 

Complete Armour Section Complete World War II tank chart.