Some regions are better suited for training for one season than the other.
Texas summers are brutal and good training for XC would be more challenging than prepping for track.
Some programs focus on one or the other. I would have preferred to have focused on XC or track in HS, but ran XC, indoor and outdoor. I was a distance runner with OK speed and sometimes ran 4 events in indoor/outdoor.
Sidebar: I grew up in the southeast and attended college there as well. I had terrible allergies and not surprisingly, many of my college PRs were in indoor track. I was able to train and race well from the end of XC through Feb/March, but fell apart during allergy season, then struggled to run close to my indoor times a month later. Summers in the south are brutal and are less than ideal for XC training. The same is likely the case for northern schools where tracks, roads and trails are under a lot of snow during the winter months.