Well the Bleach mooks are nigh worthless and I have no idea how strong a 15th officer is. So probably not them.
The Marines have better weapons due to guns and such so they have an edge while the Genin would have more fire power due to explosive tags and such.
I'm leaning towards the Naruto mooks because Marines do not seem too smart while it was very basic for ninja to get hidden as soon as possible if the bell test is any indication.
It really doesn't matter though. Iirc that 11th seat officer was so weak that Uryu thought Orihime could handle him just fine and she isn't exactly the best when it comes to Bleach fighters. So 15th is still meh.