Both are good mowers.
My buddy runs all Gravely Z's. Has 6 of them I believe. Has striping kits on all of them so they do nice work.
Ferris is good too. As mentioned before...gotta be gentle with the turns.
You won't go wrong with either.
2008 Chevy Silverado 1/2 Ton 4x4
EXMARK, TORO, ECHO