Not sure what you mean, the majority of Ruby's combat training was done against other humans, she didnt just start fighting monsters from the get go she spent years training against other people before she ever actively went out into the field to fight Grimm, and she has almost a decade of combat experience in this regard whereas Miles has just barely a year. Also him being smarter is debatable, Ruby is shockingly intelligent despite her attitude, even in the Beacon arc she was able to accurately discern the exact functions and weaknesses of a weapon just by looking at it from across the battlefield for a few seconds and has regularly come up with strategies on the fly to beat stronger opponents than herself. (Ruby was trained by Qrow after all)
Aura protects her against Venom Strike, and this wouldnt be the first opponent she has fought who has invisibility (Aura has protected characters from lightning)
Yes she trained against other people, in both her home and at Signal especially, but her actual combat experience is largely in fighting the Grimm. Actual combat isn't the same as training, not even close actually, especially because this circumstance involves the characters having a willingness to kill each other and go all-out, and the vast majority of her combat experience is in fighting with Grimm, not humans.
"almost a decade of combat experience" From what? Or are you including training? Even IF we include training, it's a huge leap to assume that her entire time spent preparing, learning, and training was in sparring matches and combat scenarios, which is extremely unlikely and unrealistic, and also unimplied. At best, being generous, I can't see her having more than half a decade of combat experience. Whereas Miles has been in many more actual human battles, all-out, real battles, than simple training matches. Most of Ruby's fights towards the end of the Beacon arc and after are with humans, but throughout the majority of her time at Beacon and prior, she has had very little genuine fights with other people.
"him being smarter is debatable" Ruby is naive in many respects, never showed to be particularly great academically (and on the contrary was implied to struggle extensively with her grades at Beacon and asked for help with Weiss if I recall), and while she is suggested to be gifted combat wise and is more than capable of leading a team, in addition to being a massive weaponry geek with extensive knowledge on that form of technology, that is basically her only intellectual strong suit. She is in the same vein as characters like Goku. Largely not particularly intelligent, though certainly not an idiot, but very gifted and knowledgeable in aspects of combat and the like. She's definitely smarter than Goku, but it's a similar circumstance. Miles is simply a genius. He's clearly gifted in terms of combat, can create strategies on the fly, adapted to his powers VERY quickly, and academically speaking he's a 1/1,000,000 genius. Ruby isn't an idiot compared to him but he simply is smarter.
"Aura protects her against Venom Strike"
Aura can protect the user from electricity, but it can't do so in the form of a resistance/immunity. It just helps the user tank it. She's still gonna take significant damage from a Venom Strike. It has hurt Aura users in the past. It would heavily damage her Aura and make it easier to win.
"and this wouldnt be the first opponent she has fought who has invisibility"
Uh, when? I just looked through a list of every Semblance in the series and I don't think there was ever a character with invisibility in RWBY. Even if she has, that doesn't mean much, it depends on how Miles uses it, and it's still an advantage either way. Not a wincon.
