I was there last September on a european roadtrip with a friend. Its an awesome place. The iconic switchback hairpin-straight, hairpin zigzag is the north side. You've got to do both, but tbh I preferred the approach from the south, lots of good long sighted fast sweepers, and the scenery is terrific.
If you have chance to explore a little, I'd try to take in the San Bernadino pass too and San Gottardo, as for me theyre even better than Stelvio (and alot quieter). If I had to pick just one, it'd be the San Bernadino every time.