Okay. Here's my feelings on all three (I was in it this past winter.)
- Requires least acting ability, technically, of the three. However. I *think* she gets the most stage time. And, a truly great actress can bring Tzietl out of the background into a both funny and lovely character (think, her solo in "Matchmaker" ..."HODEL! OH HODEL!" ...our Tzietl was hilarious at this.) She, of course, gets to 'do more', as in...she is the eldest, had the marraige arranged for her, begs to not marry Lazar, begs to marry Motel, marries Motel, has a baby, bids farewell to her family.
- Requires the most vocal ability of the three. Also has a tough scene with Tevye @ the train station. Not as weepy as Chava's scene, but still a tearjerker. She, of course, also gets the most scenes romance-wise, you get to see her relationship with Perchik build a lot more than Tzietl/Motel's, or Chava/Fydeka's. I think their love is super cute. They hate each other at first, but grow to love each other. And, of course, she forsakes her family to move and live with him while he's in jail in Siberia. Tough stuff. She sings in "Matchmaker", "Sunrise, Sunset", "Far From the Home I Love" (her big song), and gets a little bit in Perchik's song, "Now I Have Everything". So, singing wise, she needs to be aces.
- Now, I'm warning you...I'm a little biased, because I played Chava. BUT. I feel that Chava requires intense acting ability. She was my most challenging role thus far in my career, even though she really had the least amount of "stage time" than any of the daughters. I didn't get a ton of lines, I didn't get any solos except in Matchmaker...but, I got to dance (which is rare that I get to do a beautiful ballet in a show...I'm a trained dancer, so I loved that), and I made people cry during a scene. It's a powerful feeling to know that you caused people to literally start to cry. I had never really experienced that before. So, if you're a good dramatic actress...Chava is a great time to try that out.
Just my opinions!!