I have watched every episode of earlier Zoid series (Chaotic Century/Guardian Force) and later Zoid Series (Zoids Fuzors) and neither of them compare to the New Century Zero series(known as just "Zoids" in the US). Every episode features amazing battles, some goofy humor, and most importantly never leaves you bored or feeling like you just wasted thirty minutes of your life...well, no more then any other show will. Of all the anime I've seen with giant mech battles, this one pulls off epic-levels of combat without being over the top.
In comparison the other two series are a waste of time. Unlike Fuzors which forces you to wade through 13 bad episodes, and Chaotic Century which drags out the plot forever and then leaves you unsatisfied, this series keeps the action going at a regular pace, and unlike the more militaristic Chaotic Century series, the characters actually use strategy when fighting, making the fights more interesting then anything in its predecessor.
If you want to check out any of the Zoids Anime series, this is the one to look up first, or last if you want to save the best for last.
In comparison the other two series are a waste of time. Unlike Fuzors which forces you to wade through 13 bad episodes, and Chaotic Century which drags out the plot forever and then leaves you unsatisfied, this series keeps the action going at a regular pace, and unlike the more militaristic Chaotic Century series, the characters actually use strategy when fighting, making the fights more interesting then anything in its predecessor.
If you want to check out any of the Zoids Anime series, this is the one to look up first, or last if you want to save the best for last.