I say miss Sniper Riffle+Speed Semblance wins since Rubys Semblance makes her so fast it appears she is teleporting and her weapon has a high calliber for projectiles. From the appearance alone she uses a armor-piercing-round type cartridge, that should have some massive effect.

Besides that, Ruby fought in the red trailer how many Grimm at the same time and pretty much slaughtered them all single-handedly up to a 'limb flying screen' scene? Let's just say that Maka would be hard pressed to fight someone she can't hit since she can't redirect her own attack and Ruby can just go on distance with her sniper weapon and speed.

Not to mention that she is using the massive recoil of that thing actively to help her in combat. Her only weakness would be some heavily armored/very big opponent since she isn't as effective against such as shown while fighting that Death Stalker. Further the Aura they use probably is the same as a soul resonnance or something like that and she is pretty good at that, with 15 where others start at beacon academy only at 17.