This particular subject has been well covered in the past as roller versus ball.
The "longstroke" motor was fitted with a ball bearing and I would recommend putting a ball bearing back in. In this case I believe the ball bearing to be better than a roller.
Drew if you have to order a bearing make sure it is a know brand, if anyone tries to sell you a bearing that does not have the manufacturers brand on the actual bearing then do not buy it. Unfortunately like a lot of stuff there are some very poor quality bearings on the market.