The reigning world series champions unleashed all their attacking firepower in what was a breathtaking display of sevens rugby across the two days.
Tries from Andrew Knewstubb and Scott Curry brought New Zealand back into the match in the second period.
But in the dying embers‚ Tim Agaba drove over from close range to seal with win and secure the Blitzboks the maximum 22 log points.
"It was a great performance from the guys", said Senatla.
Smith was named player of the final but Senatla was among the best players at the tournament.
Christmas market EVACUATED as 'bomb found' - armed police on scene
Police said on Twitter that the package had been confirmed to be an improvised explosive device and that it had been defused . Streets in the area were closed off as the 40-by-50-centimeter device was destroyed in a controlled explosion.
Samuel Oliech stepped up to convert but Uganda offered an instant response through Solomon Okia who capitalized on poor handling from the Shujaa to score his fourth try in Dubai which was converted to leave the tie level at 7-7.
Rodwell's sin-binning turned the tide again after Ruaridh McConnochie had put England comfortable, with a late France try not converted as Amor's charges held on 14-12.
The Blitzboks now head home to South Africa for the second stop of the HSBC World Rugby Sevens Series in Cape Town on December 9 and 10.
The Kiwis had remained unbeaten in pool play and through the quarter and semi- finals at the season-opening Dubai Sevens, but never really recovered from a storming South African start in the final.
"It's easy to play well in a team as good as this‚" Smith said.
They included James Rodwell, who became England Sevens' most capped player last season, while Tom Mitchell, Dan Norton and debutant Harry Glover added to the scoreline. After an interception in their own half, New Zealand stormed forward through Sam Dickson but he got scragged short.