First is best:
"First is best:http://www.comicvine.com/wonder-girl/1683/http://www.comicvine.com/wonder-girl/37133/http://www.comicvine.com/wonder-girl/19886/http://www.comicvine.com/wonder-girl/34316/http://www.comicvine.com/wonder-girl-2/18330/http://www.comicvine.com/wonder-girl-gs/14640/" />http://www.comicvine.com/wonder-girl-ii/19887/"
Before anything is done, just curious why the first is the best. There's basically nothing written there. The Cassie Sandsmark page in your second post has the character's history. In my opinion, I think Cassie and Donna should have their own page, just as Robbie Baldwin has his own page rather than a "Penance" or "Speedball" page. I'd like to hear the opinions of others.
If you give every incarnation of a 'name' their own page, you're opening up a can of worms. Personally I don't think it's a bad way to go, but it would mean a total revamp.
Dick Grayson, Jason Todd, Tim Drake and Stephanie Brown would all need their own pages, but then what do you do with Nightwing, The Red Hood and Spoiler? And let's not even begin with Elseworld versions.
My understanding is that the site made a decision at the beginning to feature the costume regardless of who is wearing it. I'm still not convinced this was the right decision, but given that then the primary needs to be Wonder Girl which should include her history and both incarnations as Donna Troy, Cassie Sandsmark and even a brief note about Debra Winger.
I think more the idea was we didn't want Robin I, Robin II, etc. I think there should be some distinction. It wasn't my decision alone for the site. Clearly, Dick is Nightwing, Tim is Robin, Stephanie is (was) Spoiler. And Jason Todd seems to just be Jason Todd nowadays (wish he was still going by the Red Hood). My problem with Wonder Girl is both Donna Troy and Cassie are active. Donna just goes by Donna nowadays. But if we call Cassie Wonder Girl, I think there could be some confusion. What if someone looked at an old issue of Teen Titans and saw Wonder Girl listed but there wasn't a write-up. They'd have no idea which one it was. I think there could be some exceptions for the bigger characters. But like I said, it's not all up to me. Obviously, Cassie's page got through somehow. I'm pretty sure I didn't approve it but it's the one I've been using when adding her to the current issues.
Maybe Donna's big enough on her own to have her own page. I suppose the Cassie Sandsmark page could just be re-named Wonder Girl and then the others merged with it.
Why heroes can't keep a single name is beyond me. Kinda like a lot of users around here.
It's the same issue. If you look at a Detective Comics from the fifties and link through to Robin you shouldn't expect to see Tim Drake.
The issue with Wonder Girl is that no one will search for Cassie Sandsmark. People will search for Wonder Girl and then they should be given the opportunity to disambiguate between Donna Troy and Cassie. It should be like that for all hero names with multiple users. If you search for Robin you should be asked whether you want Dick, Jason, Tim or Stephanie and then be taken to the appropriate page.