It looks like you were just retopping on the fly. Try looking at other meshes with good flow and then plan the topology you want to create. This can be loose sketches, but I like to paint a topology map on the model for complex shapes. It's a little faster to work out overall edge flow that way, rather than getting this…
It totally depends. Areas with a lot of bending work out better with nice loops and less triangles. But if you have uniform deformation by 2 bone in one axis it's not like it's making your life a lot more difficult. Anyhow.. I suggest to search a bit about topology and maybe just watching some wires from good basemeshes.…