I am in total agreement...you will never everyone in agreement on this, we all have our own preferences.The best one in the world is the one that meets your requierments. You will never get everyone to agree that one gun is the best so give up on that before you get started haha.
I would say this.
HK P30 .40 V1 LEM
G19 but Im a tad bias
The best handgun in the world? Simple,the one you own. It's all personal preference.
This...remember you said handgun
http://www.rockriverarms.com/images/products/rra_lp2110v.pdf
The best one in the world is the one that meets your requierments. .