Antz is a bit more interesting than Bug's Life for one reason: it's literally the prototype of Shrek. The entire animation crew from Antz jumped to Shrek inmediately after finishing Antz
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The entire animation crew from Antz moved to Shrek afterwards. Shrek was bigger challenge for the crew, since it has a lot of things that Antz doesn't (human skin, hair, clothes, fur, lava, mud, milk, beer, fire, etc)
Antz and Shrek were the first movies by the Palo Alto division of DreamWorks (which moved to Redwood City not long after finishing Shrek). It's true that Antz shows its age, but Shrek still looks really good.