To Compare Zeta with ZZ:
Zeta is a frowny face
ZZ is a cheesy smile
If you like being slapped in the face in the end this is the Anime for you!
If you watch Zeta then went directly into ZZ be prepared. The first like 20 some episodes we completely like a happy fun time show, it kind of reminded me of galaxy express a few times for it's weird little stops that made no logical sense in the Gundam U.C. The next like 15 episodes were a little better as it move more in the direction of normal gundam u.c. It really kind of picks up after they get a new ship but it is still like WTF.... They tried to implement romance in the story line as well however it is kind of like wow really at the end... And you know how they don't show the epilogue well in this one they do but epilogue is like ok why is he doing that?
Definitely a low point for Sunrise
