Pretty sure everyone here is gonna say winter. I say winter. I had a evo8 before my rex and the evo with the tires I bought them on(all seasons) was terrible in the snow. Seriously. Like I slid on all turns. There is even a sticker on the door(if it still has it) that says switch to winter tires in winter. Switched to winter tires( had the all seasons on in snow because it was a freak snow storm) and I was pulling out of a parking spot in 6in of snow like the road was clear.
Putting my winter tires on my stockers this week and they will be designated for the season. New rims/tires in spring.
Ps. You drive a 2013 sti? You should know the answer