My friend has both. He ran the Reedy last night, and said it will be his backup motor. I don't think he has enough time on it yet to really make that decision. For 1 he's running the new 3 shoe M2C clutch on it. I would love to see it with a different clutch. Maybe a Buku or the Werks clutch which he has on his B6. Right now he's losing quite a bit on the top end compared to the B6.
Run time we never really got to touch on last night. Judging by the amount of fuel he had left at the end of a 5 minute qual I would have to say it's not going to make 10 minutes. At the Fear Farm I'm making 10 minutes with my eyes closed with my B6 Pro, and I'm quite a bit faster than him. Our track is not a easy track to get 10 on so it's safe to say that the B6 is excellent on fuel.
I have 6 gallons on my pro right now, and from the looks of it she has quite a bit more left in her. Fresh one waiting to go in as soon as this one has had enough. I'm a bit old fashioned so I don't like change if something is working for me.