As BeeAre said, JNPR can be more defensive than RWBY but I'll give my own assessment.
Jaune, as I said before, has much more theory than practice. This puts him at a disadvantage and keeps him from tanking all the time - while Pyrrha can keep tanking efficiently and provide pin-point range support damage. I keep mentioning Vindi because it's perfect to describe the effectiveness of different movesets. Javelins in both stun the monster and give major damage. Pyrrha, thus, has a melee + range ability - rather than just ranged attacks which we've seen give little to no damage.
Nora is far less experienced with her Warhammer than Ruby is with her scythe - she is also much slower with it. Lie can tank just as much as Yang with evasive tanking but can also manipulate his aura for temporary endurance-tanking as we've already scene. Weiss may also be able to tank with defensive buff spells as we've seen that she can create offensive-buff and terrain spells. Blake is a VERY weak character when compared to everyone else. I'd say she has about the same combative power as Jaune as her weapon seems to be more for exploration and obstacles.
All and all, I'd say that RWBY would win in a fight. They have enough offense to break the enemy's defense and enough defense to fall back on - as long as they aren't separated and then group'd up on.
The following happen to be the special traits I've noticed in the characters:
Jaune - Willpower
Ruby - Attack (Atk Spd, etc)
Blake - Dexterity
Nora - Strength (Atk Power, etc)
Pyrrha - Accuracy
Lie - Wisdom
Weiss - Intelligence
Yang - Charisma
None of them have true Endurance, which is odd. Most likely, CRDL's Cardin will have this trait - but we have yet to see them in battle. [I picked Charisma for Yang and Willpower for Jaune more because of what those stats do in games rather than actual levels of charisma and willpower - in which Yang would have willpower and Jaune would have charisma.]
Tenshi Nova: Yo Krest, new best buddy! Come give me a hug.
Blood Lord: May whatever God you pray to save your ass when BR reads this, Krest.
Havoc: For the love of Christ & his next-door neighbor Frank! You've successfully pissed off someone with the power to ban a Mod!
BeeAre: you are breaking new bad ground. breaking bad. meth. you smoke meth.
Ari-6: Oh no! Krest's patented sense of humor! What ever will we do without it!?
Randori: Welcome back Krest. Was wonderin' where your goofy ass went.
"I like to think, to read. I'm into freedom of speech, of choice. I'm the kind of guy who'd sit in the Greasy Spoon and think, 'Gee, should I have the T-bone steak or the big rack of barbecued spare ribs with the side order of gravy fries?' I wanna smoke a Cuban cigar the size of Cincinatti in a non-smoking section. I wanna run around naked with green jell-o all over my body while reading a Playboy magazine." - Edgar Friendly