shawnlc,
Well the SnapperPro has HydroGear ZT-3100(serviceable) trannies whereas the Hustler Sport has the sealed Hydrogear EZT trannies. The Hustler Sport appears to come with a ROPS and the SnapperPro doesn't. What size decks are the two you are looking at(I assume they have the same cutting width). They both have 11gauge decks, so I would think that the Commercial B & S engine and the ZT-3100 tranny upgrades make up the difference in the SnapperPro's price. In all fairness, you should always try to compare "similar models" across brands. In other words, you really need to be comparing the Hustler Fastrak series(prices and features) to the SnapperPro. You'll find that the Hustler Fastrak also has the ZT-3100 Hydrogear trannies. Of course, I'm a little partial to the brand I bought, but would recommend if you have a nearby Gravely dealer that you check out the ZT HD or ZT XL series and compare them to the others(I actually made an offer on a Hustler Fastrak Super Duty, but the Gravely I bought had it beat on price and features). Below is a link to the Gravely website if you want to take a look online and locate a dealer to look at them.
Zero Turn Mowers
P.S.
I'm not a "professional" lawn care business owner, just a homeowner but I gave you my opinion anyway for what it's worth:0)