I'd be more stern if he were spending my money. But, as far as I can tell, he ain't. The best gun in the world is the one you enjoy owning & shooting the most, whatever it ends up being. Doesn't mean you have to be an experienced gunnie the buy the best gun in the world, then.
Completely disagree with you on that. Go the range and look around. Look at peoples targets. They look like they used a shotgun full of bird shot vs a pistol. You will see the majority of people shooting guns improperly because they do not fit them, they cannot control the recoil, shooting at a range the gun was not intended the list goes on and on.....
Unfortunately most people do not know the difference. If you are ignorant of the factors which make a gun fit you and what you should look for how can you say it is the "best in the world." Ignorance does not equal bliss.