Our dealer has a Tiger Cub with the 24hp Briggs Vanguard. We have two Tiger Cubs both 48/ 19 Kawasaki's. Our dealer said the 19 kawasaki was $300 more than the 24 briggs. The briggs doesn't have the donaldson a filter system. We like the Kawasaki's because when you get in thick grass they have more torque than the other engines. We demoed a 52in cub with a 24 honda and a 23 kawasaki.
That what i can't figure out the 24 hp briggs is cheaper in price than the 19 kaw keep in mind a 48 in deck over a 52 the 24 honda 52 inch deck is like 1500 more bucks than the 48 inch 24 briggs make sense out of that.
Something to do with the fact that the vancrap won't last 500 hours. Wheras a Kohler, Kawisaki, or honda can last 2 to 3 thousand hours.
My dealer has several machines with 20 hp B&S Vanguards on them. all under 500 hours. I started a couple, One was smoking and you could smell it even tho you couldn't see it. Both had a good deal of oil build up around the heads. I tried a 20hp 42" cut machine out a couple years ago and the vanguard had NO torque at all when compared to the Kohler I was used to running.
Personally I would not waste money on a B&S engine over 5 or 6 hp. Spend the extra $$$ and get an engine that's built to last and has the TORQUE that you need. Find the spec sheet for the mower. most all will list the horsepower and torque ratios. I'd bet money that the 24 hp B&S puts out the same torque as the 19 hp Kaw.
I looked at a used bobcat last March that had a B&S on it with 187 hours and the mower smoked so bad looked like I was spraying for mosquitoes! I had 2 mowers before this with the B&S that were pos. You could not give me another one!
I had an 18 hp Vanguard on a Bobcat hydro never a problem. Smooth as glass and plenty of power. I had it for 1000hrs sold to a local guy 3 years ago he beats the snot out of it and does almost no maintenance and it's still going strong .