In threads like this it's common for everyone to just post their own bike, and I'm going to do just that, but it is my 'one for all' bike and all that
My Blur TRc is fun everywhere. I used to have a Transition Covert, which was brilliant downhill and on most trails where it was easy to maintain speed, but it was fairly heavy and accelerated slowly, admittedly that was because I had a heavy(ish) build and very heavy tyres.
My Blur is very very fast, it accelerates with minimal effort, is light enough and active enough in the suspension to pump and jump off anything. On rockier downhills when the Covert would be a lot easier to ride quickly, it's still fun, the challenge is just different.