Admittedly - you are right.
Man, I hate this stuff. I'd rather see independant female super-heroes.
I hate things like Spiderwoman, Spider Girl, Spider Boy, Bat girl, Super girl etc etc. They are rubbish and are usually written with superior powers to their male counter parts - just to gather attention, it's an editorial cop-out of the highest order.
We need to see characters that do not detract from their male-counterparts, and we definitely need to see more super-heroines that are unique. Wonder Woman is the only hero I can think of that is her own unique character, and is famous enough to go against the big boys.
Rogue, Storm, and Phoenix (to name a few) from the X-Men are also brilliant independant characters in their own right too.
The sooner writers quit trying to cash in on their biggest licences, and start creating some true super-heroines, nobody is going to benefit.
Spider-girl will always be compared to Spider-man, and vice versa - why don't comic writers understand that they need to quit diluting their license with weak vraitions on the same idea? It may be great short-term, but long term you damage the character (look how Batgirl ended up because of it - they decided to actually write a decent character for her once people started losing all interest).
But yeah, I hate to admit it, but Spider-girl can beat Spider-man on paper - but I bet that if it came down to it the writers would script Spiderman to win every time. Why? Because could you imagine the backlash of angry Spiderman fans if Spidergirl killed the original? That's why in the land of comic books, writers would never allow for Spider-girl to kill off THE Spider-man. Spider-man is invincible, and if he does die, he won't die for long.