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Personally, I would also say James. We see that Sirius does things FOR James, he initiates the Snape's Worst Memory attack solely for James' benefit, he talks extensively as an adult about how much he cares for James. We also see in the scene on the train that Sirius, who presumably assumed he would be in Slytherin, and seems to have changed his mind because James thought such a place was unacceptable.
"Here I thought you were alright!" from James brings out "Maybe it's time to break that tradition," from Sirius (paraphrasing here, lol). That is kind of how I see the dynamic being. I think they do consider each other equals, but when they fall into the place that feels more natural to them, I see James as being the leader of the two. Sirius would come up with ideas, but it would be James who has the final word, he would be the one deciding the course of action they'd take.
It's totally up to interpretation, but I personally think James was in a more authoritative position even with Sirius. And he obviously had leadership abilities Sirius lacked, as he was both the Gryffindor quidditch captain and Head Boy. We don't really see people follow Sirius (admire, definitely, like and want romantically, yes, but not follow the lead of). But apparently James had acknowledged leadership abilities amongst his friends as a 'free spirit/prankster' and also in a more conformed way, as it is recognized by the school and his House.
Although personally, having James as a team captain or Head Boy strikes me as akin to having Fred or George as a team captain or Head Boy, especially after seeing the way he acted in the prequel JKR wrote where he and Sirius could have been replaced just in name and physical description and had the twins down exactly. I don't see any evidence that he was a good leader, but JKR seems insistent on the fact that he was.
"Here I thought you were alright!" from James brings out "Maybe it's time to break that tradition," from Sirius (paraphrasing here, lol). That is kind of how I see the dynamic being. I think they do consider each other equals, but when they fall into the place that feels more natural to them, I see James as being the leader of the two. Sirius would come up with ideas, but it would be James who has the final word, he would be the one deciding the course of action they'd take.
It's totally up to interpretation, but I personally think James was in a more authoritative position even with Sirius. And he obviously had leadership abilities Sirius lacked, as he was both the Gryffindor quidditch captain and Head Boy. We don't really see people follow Sirius (admire, definitely, like and want romantically, yes, but not follow the lead of). But apparently James had acknowledged leadership abilities amongst his friends as a 'free spirit/prankster' and also in a more conformed way, as it is recognized by the school and his House.
Although personally, having James as a team captain or Head Boy strikes me as akin to having Fred or George as a team captain or Head Boy, especially after seeing the way he acted in the prequel JKR wrote where he and Sirius could have been replaced just in name and physical description and had the twins down exactly. I don't see any evidence that he was a good leader, but JKR seems insistent on the fact that he was.