OSB with 1x4's to finish where the boards meet. I personally like the look but It's not for everyone. All the boards are joined tight together. The OSB is REALLY thirsty when it comes to paint. Used a roller when I first painted it but had a power sprayer the next time I was ready to paint which was much faster but it helped that I already had 2 or 3 coats from rolling. Did I mention the stuff is thirsty?
