Smash 4 by a mile.
Brawl had the hype build up on expecting it to be a Melee 2.0 game, but it went off pretty quickly for me. Why? There was no big announcements for Nintendo's own characters in the game. Why did only Snake and Sonic get a trailer in the game?
Don't get me wrong, I liked Sonic and Snake's trailers; however, why did they leave the rest of the Nintendo cast with nothing to promote their entry?
Look at the SSB4 Newcomer Trailers, especially Little Mac, Robin/Lucina and Rosalina's Trailer and tell me that doesn't represent the soul of each character's universe?
Brawl was made yes. It was not bad. But it just seemed Soul less. An act against the newly formed Competitive crowd to make the game more casual friendly while shunning part of the fan base.
Here is how things played out:

- Started everything. A game that drove us made as we grew up. You could finally battle as Nintendo's Allstars in one big slam fest!!

- A game came out of the blue that we did not know about, but saw. We knew nothing of the game and yet, we were so excited whenever we learned something new in the game. Remember unlocking

and

not knowing they would be in the game? That was magical.
Melee is where the Competitive started taking root as more people started exploring more of its Mechanics.

- Then this game was announced. The hype meters were off the charts! Seeing

and

in Smash Brothers?

and

in the same game? Sign me up! However, there was one daunting thing that always lingered in the back of my mind back then.
Do you guys remember how Sakurai said that he was caught off guard for the game and was not contacted by Nintendo ahead of time? That is what threw me for a loop. Not just that, but also the fact that the cutscenes seemed pretty Soul less, well to me at least.
Then the game came out and the division started. Melee fans felt betrayed and lied to. They did have some high expectations, but nothing was revealed about the game. So:

- Project M was born. Melee Enthusiasts wanted to be able to play a different version of Brawl that supported their needs in what they wanted to happen in Brawl.
So now we have:
Melee. Brawl. And Project M. All of which are good games in their own right, but are completely divided in their idle version of Smash.
Nintendo just seemed to not care at this time. Only doing what Nintendo thought was best, when it came to handling Smash Brothers.
But then:

- Smash 4
Melee fans were skeptical because they thought it would be like Brawl.
Brawl fans were skeptical because they thought it was statement of how "Brawl needed to be fixed".
However it is different this time. Nintendo is trying to bring the Smash Fan base together, to make a game that works best for everyone. Sure it gets shunned, but that doesn't change the fact that Nintendo is not just some entity anymore. They are seen as more of a company that embraces its fans and tries to establish connections with them.
To be honest, I care more for

,

,

, and

/

/

Trailers than the one from Brawl, but why?
It is because the Newcomer Trailers were made with the fans in made, a gem of fan service to fans of those games. And the best part?
Nintendo is embracing all fans of Smash, instead of shunning a group away. They want the Smash community to come together and embrace Super Smash Brothers as a devoted fanbase.
Am I more cynical about Smash 4? Yes, but that came with age. As you get older you become more cynical and skeptical of things.
And you know what? Even as a Cynical and Skeptical Adult, Smash 4 still has me as excited as a child. Why? Because Nintendo is finally a company that shows it is willing to embrace us as a Fanbase and wants to be on good terms with us.
Super Smash Brothers 4 is a game that Nintendo has intentionally made, with full force, to embrace its fanbase and to show that it still has the means of being a great game along with all the others.
Do you know what SSB4 is? It is not just a game in the Franchise, but a Massive Stepping Stone of things to come and I would not have it any other way.