I didn't see a standalone thread for Battle in Outer Space where we could just talk about the film in general so if I missed it I apologize.
This is the first Honda/Tsuburaya collaboration I think where the human drama takes a full backseat to the effects. Before there was usually a balance but here it's more of a celebration of spectacle. The outer space stuff does look nice (I love those handheld ray-guns), and you can tell the final battle had a big influence on Star Wars years later. Honda's unity of man theme is more important than ever, but the individual characters, even the attacking aliens (who seem pissed off about something), are a little dry. Yoshio Tsuchiya does give a nice performance and Ifukube's score is very haunting at times.
In the end I have to prefer The Mysterians. I do like both movies and Battle in Outer Space seems like a natural progression from Mysterians in many ways, I just think it loses sight on a smaller scale unlike Toho's first more earth-bound space opera.