Sei Juushi Bismarck

Both are about giant robots defending the Universe from evil forces. 

In both anime a group of people come together to fight against evil. It happens in the future and they get the most modern equipment. The evil seems to seek the power over the whole world. At the end of the show a major battle happens against the main villain. 

Both anime feature fighting of giant robots. A team of humans controls a special robot/mecha which is the major defense for people on earth against intruders from space. This is the kind of anime where laser shots sounds like "pew, pew, pew".