The terms `best' and `favorite' are typically two subjective concepts when it comes the Thoroughbred racehorse. The TDN's Gary King reached out to key players from different facets of the industry to hear their thoughts. Email Gary King (garyking@thetdn.com) to have your say. CHRISTIE DEBERNARDIS, TDN Over the past seven years at the TDN, I have been blessed to witness many of racing's greats, which I thought would make it very difficult to choose just one. But, when given this assignment, there was one horse who immediately came to mind,...