Bear in mind I'm 18 and "fearless" here!! [ok nervous rider but it's behaviour that puts me off, not age or green-ness]
I prefer my breaker over my "finished" horse. My "finished" horse has a few... ahem... habits. I don't like them. They're desirable things for the level he WAS eventing at, but he's way too fast for the level I want to event him at. Tried training... nope... he's an arrogant old git and thinks he knows better than I do. I grant that he actually DOES, he just seems to... forget that I don't want Prelim speed. I want BN speed at best, for now. I don't want him hauling butt. We don't need to go that fast. He'll be awesome when I get the guts to jump solid fences at Prelim height... I like showjumping style fences that fall down if you knock them.
Don't get me wrong. I have a lot of fun with him. I've just had a LOT of challenges too. I think he's been more difficult than any of the greenies I've ever had...
As to my breaker, now that I've got her past the issues she had from her previous owner, I know that any problems are of my doing, or simply because she's a baby. I love that. And I love her work ethic. I have full faith in the mouth I've put on her, ESPECIALLY after today's ride when all she wanted to do was run but not ONCE did nervous little me feel unsafe or out of control. I was on bareback and we did have some pretty decent spooks and a couple of moments where had she not been listening 100% to the rein, she would have bolted. She had that feel about her. She's sensitive, reactive, and hot... but I feel safe on her. On paper she's all wrong, but in practice I don't think I've ever had a horse that was so right. Oh, I fought with her alright - when I got her she was dangerous - but now, with no more issues [just a few little things I'm working with her on that are small handling things, young TB's don't get those things worked on], I love how sensitive she is, and I love how smart she is. And I love that I'm the only person who's ever been on her back, so I know EXACTLY what she does and doesn't know. I know that any holes in her training are of my doing, and I'll be having my coach jump on for a training ride sooner or later to make sure that I'm not leaving anything important out of the foundations.
Made horses are better for the impatient, the inexperienced, or those who simply don't want to work with a green horse for whatever reason. Green horses are wonderful if you're the sort of rider who hates fixing other people's mistakes.