Which Tanya is better? That's a tough one. Kari Wuhrer is real cool as Tanya. She has a great bad@$$ attitude and looks like a million bucks. However, she would most likely give you the cold shoulder. Classic Tanya looks just as good, but in a diffirent way. The pic they use in game, as opposed to the cinimas, is rather decent. Her voice though, ugh. Forced to choose, I'd probably choose RA2 Tanya because of her being Kari Wuhrer, who basically plays herself as Tanya anyway.
Speaking of which, what other C&C women do you like? I quite like Athena Massey, the actress who plays Eva, who does martial arts and yoga and is writing her own comic book. But Zofia was brilliant, especially when she briefs you on bombing Yuri in the Kremlin. Further away from home, Sydney was good in Renegade, and I quite liked Super Lotus in the Generals expansion and General Leiang (the secret general you face in Challenge mode).