Yes, this is an interesting thread and shows again how hard the 'best...' question is.
It's all very well having 'wonder weapons' but you need a lot of them and everything was diminishing for Germany, increasing for the Allies, post D-Day.
To me, the Tiger Is/IIs are like the Me262 - wonderful things, and maybe a better fighting design ( who knows ?
) but, if the air is full of P-51s and the ground is crawling with Shermans.....
( Just as an anecdote to the main topic, my Uncle was in Shermans at the very end of the war and told me that the 'Ronson' reputation made him very uneasy - his crew were in constant fear of being 'brewed up' ).