Is knowshon moreno the feature back for the Denver Broncos?
Yes, as of right now. John Fox is known for his two-back system, so I would expect to see the Broncos add a back in the draft or free agency (whenever a deal is struck with the CBA).
Because Beanie Wells possesses both size and speed it is believed that he is the better of the two back suited to play in the NFL, but because both were injury prone in College and have had injuries in the NFL neither appears to have an advantage over the other. Moreover both excelled in college thanks to overpowering Offensive lines, only time will tell.