That depends on my application. If I'm hunting whitetails from my treestand and my shots are going to be limited to around 30 yards and in, I will take the heavier arrow. On the other hand, if I'm headed out west to hunt elk or muleys and could be faced with a 40 plus yard shot I want the lighter arrow with the flatter trajectory. Personally, I'd be happy to get those speeds with either arrow and my short draw length.