So, 24 feet shorter than Prince's shot.
I can live with the idea that Thome's shot was 24 feet shorter than Prince's, but I don't agree on the measurement of either.
Prince hit a ball almost off the back wall of a standard two-deck stadium. 48 rows over the left center wall. 500+
Thome's ball cleared an 18 foot wall, the lower deck, 8 rows of the upper deck and was actually knocked down by a fan reaching above his head to try to catch the ball. That ball would have landed only 80 feet beyond the outfield wall? So, if I put an 18 foot wall at home plate and threw a ball so it went 20+ feet over the wall traveling at a speed so fast that it could not be easily caught by someone say sitting 30 feet higher and 25 feet behind the wall, the ball would not even reach first base? I really, really doubt that.
My verdict -- Prince -- 510. Thome -- 490.