Bubba Watson currently leads the PGA Tour in driving distance, averaging over 315 yards off the tee. As seen in the video we've provided, Bubba utilized his ability to bomb the ball en route to a Masters championship earlier this year.
"Bubba Golf," as it is known to his fans was created entirely in the comfort of Watson's own home; he's never had a swing coach in his life. Unsurprisingly, then, we can understand that a self-taught swing has a few things that are unique to it, but rarely do they ever prove so effective.
The lefty's main strength is his hand action. Bubba is able to produce hooks, draws, fades and slices at the literal flick of a wrist. At takeaway, Watson's arc is one of the longest in the game, with his hands fully outstretched by the time his hands make their first move past parallel.
Like a few of his peers mentioned earlier, Watson's hands are extremely high at the top of the backswing, which is made possible because of his generally upright posture.
Aside from having top-notch shoulder turn while the hips begin to uncoil, Watson is able to get a bit more "juice" out of the ball because of his front leg "snap" immediately before impact.
Now, this move worked for early 2000s Tiger, but eventually had to be modified to prevent injury. Despite his youthful image, Bubba is actually just three years younger than Woods, so this is something we'll have to watch over the next few seasons.
Aside from these descriptions, the best historical comparison to Bubba's swing is John Daly. We know how long he was.