I'm not under 20, but honestly that's kind of apples to oranges.
Despite them all being mecha shows, Layzner is more a serious war drama whereas Macross Frontier is just fun pop entertainment.
Orguss is just ok. It's basically Macross with more a more meandering plot and Millia Athena going "ojisama! ojisama! ojisama! ojisama!" for twenty episodes.
also Mohm the robot girl is totally moe~.