So when it comes to BanG Dream a lot of the pairings that I see a lot are from two bands: Roselia and PasuPare (Sometimes HaroHapi). Which I understand YukiLisa, SayoLisa, AyaChisa, MisaKanon, and even SayoTsugu are often used in events and thus have a lot of moments. Not to mention, the bands are just popular overall.
MocaRan tends to be more in the background, it's a childhood best friend dynamic with contrasting personalities. I love it. And I love this, Moca and Ran are so cute together.