The Best turf/dirt horse in the last 50 years?

[Calzone Lord]

For a foreign horse, you're talking about a Dubai Millennium.

Absolutely dominant turf horse at 10f in Europe -- obliterated everything in his Dubai dirt races.

Also had a very aggressive running style better suited to American racing.

Very American pedigree as well, sire was Seeking the Gold, who you think dirt, not turf. The 2nd dam Fall Aspen won the Matron, Astarita, and Prioress at Belmont, and she dropped a Breeders Cup Juvenile and Preakness winner in Timber Country among many other good ones.