Define "best":-

Highest KDR?
Highest win/loss ratio?
Most wins overall?
Best all-timezone coverage?
Highest kill/ISK ratio?
Corp that has delivered most consistently for you before?
Most highly recommended by people you trust?

Okay guys, you all have to realize that 0.0 won't come for at least another 1.5 years. Pretty long time.

Another problem that nobody realizes either is the battle system. In EVE you can attack multiple locations all at once because its all on the same server and you can get anywhere with no problem. You just need the numbers to do so.

In Dust it will be based on Contracts. The battles will not be instantaneous because of how the battle system will work. Hey, yeah you can have the numbers to take all the districts at once. Will it happen no. Because most of your forces will be waiting for your opponent to accept the defend contract stating that their forces are ready for battle.

I highly bet that there will be a 3 hour plus reinforcement timer for districts. So that small corp that controls the whole planet can effectively defend it without needing the numbers to defend all of them at once. All they have to do is play one game at a time. With a 3 hour plus reinforcement timer, a great corp can go through 15 districts in no time and defend it well because they are facing the same opponent over and over.

The problem with bigger corps will be when they start the attack process with multiple districts, they will be at the biggest disadvantage. Because they will need there players on standby while the defending corp can choose what district to defend at a time. They could hire another corp with the numbers to defend all the targets at once and surprise your huge corp if it wasn't in fact ready to do all the battles at once. Most likely be a 10min notice for the attacking team that the defenders are ready.

Corps with big numbers will be in a bit of a surprise when FW and Null come around as numbers will not matter. CCP has stated that FW and Null will cater to smaller corps.

The smaller more efficient Corps will be a lot more power than the corps with 300 plus members.
Skill>Numbers

You can have 300 average players, but those 50 highly skilled players will be able to win every single battle. You can have 300 members but you can't fit 300 players into 16,24,32 match.

As I stated above if you didn't read. Corps can always hire other corps do some dirty work for you. You still have alliances if you choose to. All I was stating is that you don't have to be with a big corp or big alliance to be great at the game.

EVE tactics will not work in Dust as they are two different games with two different game mechanics.

If anyone doubts this post, you obviously never heard of the 300 spartans.

Also take into account that players won't always need to field large, powerful corps.

Sure, they're great for spearheading an attack, but they might be too "battle-hungry" to be good defenders. It might also be more effective just to send in a grunt corp as a distraction while a stealth strike-force does the real job.

Not to mention it's highly inefficient. Why spend a few hundred million ISK getting the best of the best when you just need to spend 5 million or so on a corp that isn't great, but good enough to get the job done easily enough? (Just random numbers I through out there)