While the South Korean panther is undoubtedly a fine tank..there are worldwide, several in the same category.
  It is quite an audacious statement to say it is the "best tank in the world".. which caused me to consider the expertise and experience of the 
    claimant.  Surely, he must have much armored warfare experience and engineering expertise to make such an outright claim.
  So I looked up the author of the article, one Peter Suciu, so as to ascertain his competence, to make such a bold statement.
  Here is what I found..   
https://www.amazon.com/stores/author/B002SAX4NA    Although it is likely a fine competitor in the top 5 or 6 tank models...  As I see it, with competing tanks and all the features 
    involved, t would be extremely difficult to  pronounce any single one as "BEST" !  
  Consider this, For it's designed purpose, middle east desert and urban warfare, the Israeli Merkava..has to be near the pinnacle.. since it was 
   designed and engineered for that purpose.
  For the mountainous terrain of South Korea, the adjustable, activated suspension on the Panther, must work very well for final zeroing on target.
 The German Leopard and the French LeClerc  are perhaps ideal for European defense.    
  Then there is the "proof is in the pudding" concept.  Over the years, new models have been produced that promised great things..until they faced 
   real battle..
  So far as I know the American Abrams and the British Challenger...are the only current ones that have been tried in the smoke of battle...and both have acquitted themselves very well.
  We have yet to see how certain ones now in Ukraine hands have done..once the boasts and propaganda have been analyzed.