I mostly use Federal. I don't think there is a "best." However, here is what I have compiled from various gun rags:
Federal primers are considered to be slightly more sensitive than other brands, because Federal is the only company to use "basic" lead styphnate. Lead styphnate is the primary explosive agent in centerfire primers. There are two types: basic and normal. The difference between the two is in the chemistry, but basic lead styphnate has a finer grain structure and is, therefore, more sensitive or easy to ignite. All the other manufacturers use normal lead styphnate.
There are also differences among the various manufacturers in the chemistry of their primers and the construction of their cups and anvils. CCI pistol primers are generally assumed to have a slightly thicker cup. Federal primers use a thinner cup than CCI, Winchester and Remington, so Federals can ignite with a lighter blow.
Remington 7½ primers have a thick, soft cup (some say just harder) which makes them easier to light but also very tough. They should eliminate any problem from the cup flowing into the firing pin hole.
Winchester primers are fairly hot. In standard rifle primers, Remington and CCI are normally mildest and Winchester the hottest, acting like a very hot standard primer or a mild magnum, with Federal 210 in the middle. Federal 215s have the reputation of being the hottest magnum rifle primers, but tests indicate that’s not necessarily true anymore.