I've been studying ww2 for the past 20yrs, with emphasis on germany.
Fact: heh u americans will love this . Hitler did not declare war on france and england only Poland. England and france declared war on germany. So the escalation of WW2 was done by the allies not germany.
after the conquest of france hitler offered churchill a ceasefire ( he wanted to invade soviet union) but was turn down.
best tank, no particular one, Pershing was a tank destroyer not a tank per say. was mainly made because the shermans was not up to standard to put it mildly ( germans tank crew call it something like matchbox because it was so easy to kill and alway caught on fire).
nobody mentioned the Centurion, which was also made because of german supriority to allied tanks.
The Panther was used by france after the war, T34/85 was used until 1960/70's. Centurion was used by Singapore until 1990's, ( I may be wrong about the year but definetly close) .
I my personal opionan the best tank, in term of mobility, accuracy, weapon and armour would be the Panther. point to note the t34/85 did not even have a radio/ was very unconfortable for crew, but cheap and robust design.
The Pershing, centurion, JS3, jagdtiger only spent 2-3 months in the war so is not considered. All suffred from engine/design problems mainly from being rushed to the battle field. Besides in that type of terrian airpower was slowly taking over as King of the battle field.
The german MG42 was so good, that it is still being used today 2005 only rebored to take the nato 7.62 round. it was the first true GPMG.
I agree in that in the beginning of the WW2 the allied tanks were better then german's. their success was because of better training, tactics and Proffesionalism.