Ok wow *tries to erase your face*
Hear me out.
TW3 has better graphics than DAI.
TW art style and aesthetics is far more consistent than DA's art style and aesthetics.
TW3 has better soundtrack than vanilla DAI, only Trespasser is capable of matching TW3 in the soundtrack department.
TW3 has no DRM on it, DAI has DRM.
TW3 has far more free DLCs than DAI.
TW3's paid DLCs contain far more content than DAI's paid DLCs / TW3's paid DLCs have better bang for the buck compared to DAI's paid DLCs.
TW3 did large cities far better than DAI. Novigrad makes Val Royeaux look like sh*t.
TW3 didn't spend time lecturing, proselytizing and preaching to its audience, DAI did just that.
TW3 NPCs are far more realistic than the DAI NPCs.
TW3 is open world, DAI is not. Therefore, TW3 has more content than DAI.
TW3 did strong female characters far better than DAI. Ciri and Yennefer > any DAI female character.
TW3 does espionage and politics far better than DAI.
TW3 does monster boss fights far better than DAI. TW3 does monsters far better than DAI.
TW3 makes you feel like you are a Witcher with the quests, lore, bounty, Witcher senses, dialogue options to use Axii. DAI makes you feel like someone who does random MMO quests instead of the head of an organization.
TW3 has far more diversity in character sizes and heights. DAI has everyone with a racially fixed height and weight.
TW3 has better hair than DAI.
TW3 does magic far better than DAI. TW3 mages say certain words and use all sorts of magical gadgetry. DAI mages twerk around their staves and use magic 8 balls.
TW3 does Elves far better than DAI. Elves in DAI look anorexic, Elves (Aen Elle) in TW3 are badass motherf*ckers. Eredin and Co would have made Solas, Abelas and the other Ancient Elves look like pansy wimps. Avallac'h doesn't need a magic 8 ball to do impressive magical feats.
TW3 has better villains than DAI. Eredin is far superior to Corypheus.
TW3 allows you to play the in-world card game (Gwent) but DAI restrict Wicked Grace to a single cutscene to get Cullen naked.
TW3 does mounts and mount riding far better than DAI.
TW3 does recurring characters and cameos far better than DAI. Vernon Broche is there because of the story, Letho is there because of the story, Sile de Tanserville is there because of the story, not because of shoehorning.
TW3 has better songs than DAI. The Wolven Storm makes Maryden's lyrics look cheap.
TW3's Skellige is far superior to DAI's Frostback Avvar.
TW3 tackled social issues far better than DAI, thanks to the lack of politically correct nonsense. You actually see the oppression of non-Humans and mages in TW3 compared to the implied stuff in DAI.
TW3 did romances better than DAI.
I can keep going on and on and on...The reality is that CDPR made Bioware look a a bunch of rank amateurs fumbling around with crayons (politically correct crayons) while they crafted a masterpiece of RPG gaming.