Some believe an angled path is more natural than a straight up and down smith machine track path. Others believe the opposite that straight up and down path is the more natural path.
I’m inclined to believe the straight path is more natural because most presses follow, or should follow, a straight path.
However, an angled path may make the smith machine more stable, singe the weight is being lifted towards the center of the machine. But I think you should try both styles and see what feels more natural to you, before you decide on the best smith machine.