Asking which ammo is the best is liking asking what caliber is best. Everyone has their own opinion.
In most cases, they tend to all be right for one reason or another.
For hunting, I have been using Winchester ammo as of late. It's always treated me well. Then again, so has Federal. I'm just not using their product is all.
Hornady, Nosler, and others also make a good product as well.
The thing is, most of the major manufacturers make so many different types of rounds you can get the same basic rounds from different companies. Making the conversation even more complex.