The Teebird-L is the more beginner-friendly of the two models. It was my farthest flying disc for quite a while. And it's very straight which means you can concentrate on your throwing form without worrying as much about disc angle and compensating for fade.
My friend saw me throw my Teebird-L and bought a Teebird by mistake. He had problems with it fading left so I just gave him my old Teebird-L, although now I think he has enough power that he can throw either one.
I had a classic Roc for awhile (I still keep it in my bag) but as I got better I started turning the Classic Roc over. It's good for beginners, good for touch shots, but not quite as good for real midrange shots. I switched over to an MRV, which I like much better and use as a driver on a lot of short, woodsy holes. The Roc (not classic) is pretty much the equivalent of the MRV. Another good midrange is the Buzzz, but I don't like it as much. It feels too big and slow. I've seen people throw it with a lot of success so it's just a personal thing with me.
I think if you got a Teebird-L and a Roc you'd have a nice setup. Wraith for max distance on an open field, TL for most of your drives, Roc for midrange, and classic roc/aviar for the short stuff. I think you'll find you end up throwing the Teebird-L and Roc for the majority of your shots and they are great "neutral" discs to learn on.