1. Naruto obviously, anything Jiraiya knew, Naruto could learn, while there were somethings Sasuke would definitely have trouble learning from Oro.
2. It all depends on the teacher, Kakashi found it easier to teach Sasuke because they both had the same power, Oro found it easier to teach Sasuke (although he never trained Naruto so who knows Oro might have trained him well) because he was a sharingan fapboy and had all this knowledge about its power. Jiraiya found it easier to teach Naruto because he was like Minato and Naruto was capable enough of learning all of Jiraiya's strong jutsu. So id say it depends
3. Naruto obviously, Sasuke was the one who killed Oro, while when Naruto heard that Jiraiya was dead he wanted to tear pain to shreds.
4. Naruto more than Sasuke, like Jiraiya, Naruto is also on the path to peace. While Orochimaru was a crazy psychopath that just wanted more and more power, sure Sasuke was also a crazy power-hungry maniac, but he only wanted power to achieve his actual goal, killing Itachi.
5. Do you mean by which is more respectful towards their master? Well its gotta be Naruto obviously, i don't think killing your teacher and only using him to gain power is called being respectful.