This is a subtle design feature that you may notice while you are researching. Though it is subtle, it is important for you to know the difference between a bent shaft and a straight shaft. For the most part, you can consider bent shafts to be the cheaper alternative. The reason for this is bent shafts typically are engineered with fewer components. In addition, with a straight shaft, they will generally get under bushes and hedgers much better.
Oh yeah, and bent shafts are typically fixed length and can’t be adjusted. To be honest, besides cost, there is not really much that bent shafts have going for them.