I have had many OTT TB's it really depends on the horse's attitude and your capabilities. Sorry to be useless!
However if it helps I have attached a recent photo of my newest OTT TB gelding, his name is Captain. He is not your average TB he is quite lazy and laid back despite winning a race and placing in the 8 starts he had.
Captain is not much of a fan of turning or collection, however on the few short weeks I have had him continous work he has come up very nicely!
He went for a day out on the weekend and entered show hunter ridden and took out reserve champion
not a bad day out!
He is the bay with the rider wearing a grey jacket