In my opinion, I think you need to consider that based on which setting you currently use on your other titleist woods and/or driver. If you are using a A-1, B-2, C-3, etc. setting and then see if that setting in the 910H will get you the 20 degree loft that you are wanting. I think it is also based on how you want your ball flight and whether you like a open or closed club face in your clubs. Ryan

It depends on your ball flight. If your miss is right, you'll play the percentages by going with the 19 degree since you'll close the face/make the lie more upright slightly to achieve a 20 degree effective loft. If you pull left or draw the ball, the 21 degree could be better since you slightly open the face/flatten the lie to achieve your desired loft. The length of the club should really not be a consideration since that is a very small difference, not enough to affect control or distance in the long run. In addition, the rule of thumb is a degree of loft is about 3 yards. Not much to be locked in on having your hybrid be exactly at 20 degrees. The nice thing is with the 910H you can fine tune it.