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Super high speed cameras measure spin rate at launch.  Of course, it slows down during the flight.  
There was lots in that site that was way beyond my pay grade.  I cherry picked the stuff I could understand pretty readily.
Does a lighter bat with more swing speed impart more or less spin to a ball?  I have no idea.  Maybe it has no impact.  But if it does then there is some ability to "tweak" a bat just as golfers tweak a driver.  
Seager's tater with the lowest launch angle was 24.9.  His "moon shot" was about 36.  I would bet that almost all homers fall into those parameters.  80%-90% would be a decent guess.
Guys like Seager, when they hit it in the air to the pull field they have nutted it.  But something goes amiss with a guy like Smoak.  Clearly he has the strength to whack 'em out but he either doesn't square the ball (losing ball speed....this is what Smash Facton in golf measures) or he doesn't swing the bat as fast or he's got some spin issues.
Is there a site that measures swing speed.  You would really need to look at maximum swing speed where you guess fastball and turn it loose on a fastball AND average swing speed, which may impacted on pitch recognition.  If you are way ahead of a curve ball you are decelerating (or trying to ) to get bat on ball.