British Crusader. Mk 2 with 2 pounder gun which was one of the best anti tank guns in1940,but retained too long by the British Army. The 40 mm sloping front plate could only be breached at very close range by the German 37 mm anti tank gun
The British army was the first to use the M3 Stuart tank from 1941-42. The Stuart took place in Operation Crusader during the North African Campaign, with poor results.
British army 1945 Firefly Sherman - with the larger much more capable British 17 pounder main gun - could destroy any German tank and was a much better gun than the standard US gun