I think Cassie has a lot more personality than Donna, and is a lot more realistic. And she doesn't have ten million different origins. Back in her Young Justice days, Cassie was actually really smart. Whereas Donna has always been written as shallow and not particularly bright. Back when she was in the Teen Titans, Donna was a boy-crazy idiot.

I still prefer Donna, at least when she was Wonder Girl and wore the classic red uniform. I think Donna's "shallowness" in her Teen Titan days was partially due to the time period she was written in. Cassie hasn't exactly been immune to boy-craziness either. 

Donna is way better than Cassie

They are both Wonder Woman clones ;)

Young Justice Cassie > New Titans Donna > Donna the rest of the time > Cassie post Graduation Day (ie post losing her personality)

Diana > Donna > Cassie for me.

Donna's more BA.

I think it's easier to prefer characters you first got to know.  So I knew about Donna & Diana but I'd never read any of their adventures.  I got to know Cassie through Young Justice... so I love her more than the others.  She was just an awkward kid who was trying to be a hero, and there was a certain level of empathy there.  Not so much any more... but she's still my favourite out of the Wonder Women.

no one likes Cassie.

I am so tired of this @Quote bug.  Anyway, SUNMAN, you didn't give a personal opinion at first, you stated something as if it were fact.  However, I genuinely do agree with you... when you actually did give an opinion.  It's sad to see a character written into an empty stereotype.  As if all teenage girls only exist to date one bad choice after another.

Donna Troy should never have existed in the first place. She was only created as a result of an editor or writers's mistake in assuming that Wonder Girl was Wonder Woman's sidekick rather than Wonder Woman herself.

And yet, she's still a great character.

Why is she a great character???

The interesting thing is that although Donna is a Silver Age character, most Silver Age fans don't seem to like her. Most of the people who like her seem to be Modern Ager fans. Why is that, I wonder?

For some reason or another I'm much more familiar with Casse,so I sort of turn towards her naturally.

d's better than cassie

I like cassie

I like Cassie better as a Wonder Girl. 
 
That being said, I like Donna for what she's become on her own. 
 
Its interesting, of all the original Titans, 3 have become their mentors at some point.  Dick is the current Batman, Wally is Flash, and Donna was Wonder Woman during the one-year gap.  Even Roy has taken a costume that resembles his predecessor's more closely.

Their both the same to me.

I love them both but I definetly like Donna Troy more cause some writers are screwing up Cassie which is the reason why so many people hate her .

I prefer Cassie a lot more, I just think that she's a better character, she's also a bit more modern.