That's an interesting observation.

I could understand Loghain's army being more professional. He dealt such things during the rebellion and has become Ferelden's de facto 5 star general.

Now Orlais, they fancy themselves an empire, like Rome was. Their leader are entitled "Imperial Highness" which says a lot. Plus, as someone pointed out, they're trying to conquer Nevarra. I have a sneaking suspicion they've got a pretty good army, better than Ferelden's.