Alan: Either length will work fine for you. Might think about your intended use. I had a 64-inch bow set up that I used mostly for targets. Used shorter limbs to make a 60-inch bow for hunting. The longer bow was sure a pleasure to shoot.
I shoot mostly longbows so ultimately let my B Bear riser go. Still shoot no. 1 and no. 3 limbs on my A Bear risers though. Nice thing about Bear TDs, you can always buy another set of limbs later, or several. Now that's having your cake and eating it too.