Now I think DA I had the best sound track in a game of all time. I also think that the only thing that DA O did better then DA I is some of the side quests in DA O felt more integrated into the plot/ setting then they did in DA I. in DA I most of the side quests felt entirely unrelated to the world around them. Another thing that Witcher 3 does really well to.
Tactics, protagonist, superior combat system best tactical camera, more specializations, arcane and dual wield warrior, bioware's toolset, legendary gear even with spoils dlcs DA:I don't have a chance, great array of choices, superior main and side quests, voice acting, storytelling, better characters, better villains (Cory was a joke), DA:O -> gameplay over romances, DA:I romances over plot, DA:O dark medieval theme, DA:I disney like theme, deeper interactions and conversations, as a set up game had more better solid lore, true rpg over sandbox/movie any day, personally DA:O companions are better Morrigan,Leliana and Alistair, better pacing, healing spells, real decisions that change everything not whatever you'll say everyone will tell how glorious they were and that's it, hairstyles, harder fights, origins credit soundtrack is the best-Fact-, better background story. graphics suits my retro taste, better final battle AD>Cory
I can go as long as you like, a classical old school memorable rpg, ranked by most critics among the best of all time.
I know from the forum you enjoy DA:I most, and i applaud you for that, but DA:O wipe the floor with DA:I any day of the week.