If you look at their heading in the loops below, you can see that 92L has a bit more of a west-northwest track to it. While 93L in more due west. They are both moving at about the same speed, 15-20 mph.
|(Model Tracks for 92L)|
|(Model Tracks for 93L)|
Just going with the highest probability and the most consistent model showings so far. Both systems do develop, and both system do come very close to the US. It all hinges on the timing and strength of a trough that is forecast to move into the eastern US later this week. So we will continue to watch these things closely.