Hmm, I suspect my own pick for all time favorite will be discussed at length in this thread. So I'm gonna be "that guy", and go a little contrarian by bringing up my honorable mention.
Sami Zayn vs Adrian Neville
I know this feud might not have endured the test of time just yet, being as recent as concluding in 2014. However, this feud deserves celebration in terms of being straight forward booking 101 with flares of nuance. Having seeds planted many months in advance, when the two were jocking for number one contendership for Bo Dallas' NXT Title. A heated match ends with Sami rejecting Neville's handshake, kicking Neville's hand aside and hugging him, before raising his hand.
Fast forward, Neville wins the NXT title, and endures as the consummate babyface champ, while Sami struggles for contention. Eventually, their paths cross in a fatal four way, and when it looks like Sami is going to pick up the win, Neville exploits a heel tactic, pulling the ref out of the ring, leading to Neville retaining.
Neville continues to flirt with his dark side, while calling Sami's own killer instinct into question. As everything snowballs to a conclusion, Sami puts his own career on the line for one more shot at the NXT title.
R Evolution comes around. Adrian plays a perfect heel to Zayn's sympathetic story. Late in the match, Zayn has the opportunity to take the easy way out as the ref is unconscious. All the while, Corey Graves, who announced his forced retirement , is pleading with Sami from the commentary, save your career! But Sami doesn't, and wins perfectly clean. The roster celebrates with Sami. Sami extends his hand, which Neville kicks aside to pull Zayn in for a hug. The ppv concludes with a seamless transition into Sami 's next feud when he is betrayed by his best friend, ìwho finally arrived to the WWE that very night, Kevin Owens.
All in all, it did everything a great feud should. The stakes were real, the characters were challenged and we're forced to evolve, and it wasn't bogged down by overcomplicated bookimg.
Gonna go watch my best of NXT dvd, now.