whats the difference between world of tanks and blitz

To conclude, what I want to know is how WN7 and WN8 (respectively) is calculated and which one is more efficient to know how good of a player you are? But in the WoT and WoT console communities they tend to use WN8 more. Which one of the measures is the most accurate for knowing how good of a player you are? I know that WN8 is more modern but in the WoTB community, WN7 is more widely used than the WN8. To see some of these numbers in play, here are the links to the main stat pages that players use WoT(WN8 only) | WoT | WoTB (The WoT ones are my 'noob' account for comparison, WoTB is the stats of the top clan) WN7 and WN8 have both different ways of calculating and percentages of which one of these stats will affect your final score.

I know that your winrate, average damage, average kills, platoon rate, average spots, KDR, DR, and many more are put into consideration. I know that for all of these games your WN7 / WN8 is calculated the same way but I do not know how they are calculated? If you play WoT, WoTB, WoT Console and other Wargaming games, you'll know your 'unofficial' stats are normally measured in WN7 or WN8 (and sometimes STAR1 and efficiency).

Whats the difference between world of tanks and blitz