Together they seem kind of strange thematically. I believe, but might be wrong, they both have the same base defense, but Chain is lighter and bonuses against cutting instead of blunt. Hmm. It's not a bad thought process, but the only thing that comes to mind is who you are facing. In late games against Gilden or Yithril, they tend to use troops with the Maul or one handed Maul, the Sledge. But, you can produce more units that are strong against blunt earlier, even if they are not as strong as full plate...I think it would work fine, overall I think you will break even against blunt and be stronger against cutting attacks