Product review (5 stars): The best choice when getting a new washer
The best choice when getting a new washer.  90-degree elbow is high quality and flows freely allowing installation without crimping hoses.  Many people don't intend to crimp the hoses, but if you don't have hose bibs recessed into the wall, its likely your unit will move over time and crimping can occur.  Not only are these high quality braided hoses that last forever (ok, I've only used a couple sets for 5-7 years each, but they show exactly zero wear), but they're some of the cheapest insurance you can buy against flooding your wash room.