both have been through alot more stuff than sakura, thus more emotional. the only reason sakura may APPEAR to be more emotional is because she breaks down in sadness alot faster than naruto, while sasuke (pre-taka) is more subtle with his feelings.
Sakura. If you read Naruto you would know that she is very emotional especially about Naruto. But she is "stronger" sometimes than Naruto. I think Naruto is more emotional towards sasuke sometimes but overall Naruto is more determined and strong.
Probably naruto. Sakura is mainly emotional for sasuke, sarada, and a few others. Naruto is basically like that for everyone hence him going on rampages or getting upset and using kurama.
naruto was shown more. things like jaraiyas death,meeting his parents and getting depressed during the war and where he actually shed tears when seeing his enemies memories