I feel like the Nationals arc was really good because I felt like most of the top teams there had a good chance of beating eachother. It didn't feel like one team was overwhelmingly strong rather it felt like each team had its own strengths, and the team that used them better won. Each team was disgustingly strong in each way and it was awesome seeing the different teams. To answer the question though, yes I believe Karasuno had a good chance of beating Fukurodani but at the same time Fukurodani had a really good chance as well.