Reason:
*Armor
*Giant Cannon
*Wheels
*Treads
*Larger Size
*Trumps All forces (Ants can't even stop birds, well they can but that's only in a group.)
*Cutting Edge Tech (It's basically the super enhanced version of hive mind advancements, this one makes Ant's tech look like a napkin.)
*Can go on all terrain
*Easier to repair
*Can be in rain
and don't bring out "LOL, Ant can crawl" Ant can't Crawl while paralyzed in fear, read the books. Now going to The assembly line is possible. BUT, it still has the Cutting edge tech, that thing can counter anything Ant can bring, sorry, lucky man or not Ant is a napkin, and a dead one.
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Ants Reasons: Full body armor Can move across all terrain even swim across water Can scale walls Has super strength There are millions of ants for every 1 tank Is self powered and does not need a 3rd party to control it Has ability to construct complex bases in mere hours Produces poisons that can be injected into victims Can regenerate it self after minor wounds