I go shooting most summer sundays with a friend, he has a pedersoli roller and I have a shiloh sharps.  He outshoots my more then I care to think, and his gun is much simpler and more reliable.

I also have a roller, but like shooting the sharps but its a labour of love to maintain.  Finger lever spring has broken once so far, and most guys keep a spare one and perhaps a firing pin.  As far as accuracy, reliability, handling and cost all taken into account, the rollers a better gun.  Also much easier to shoot prone is thats your game.