Main character, companions, party banter, dungeons, romance, world, lore, main story quests. I could go on but that should suffice.
Have you actually played Witcher 3?
Aside from companions and party banter (which Witcher doesn't have), I thought TW3 absolutely murders DA:I in all the other areas.
Dungeons, maybe, as DA:I dungeons are more set up like classic MMO dungeons (which isn't a bad thing), and TW3 dungeons are more Dark Souls-style crawlers.
Main character is different, but Geralt always felt more my "own" than any of the bland Inquisitors I created.
He's likeable, he's gruff and mean and dangerous and funny and sarcastic - but most importantly, you always know his motivations and what makes him tick, who he is etc.
My inquisitor did a bunch of stuff because "plot" and I never identified with him at all.
(Bioware can do this right btw, I loved my Warden, even my Shep in ME1)
Main story isn't a contest, the pace felt much better in TW3 and the urgency to go after Ciri never let me go... It's also MUCH longer than DA:I main story. And MUCH deeper. DA:I story was just really ordinary and uninspired.
Romance is debatable, but comparing Triss and Yen to Josephine or Cass etc. feels like a joke to me.I can compare them to Morrigan, Leliana or Alistair, but DA:I romances leave much to be desired IMO.
Lore is fine in both games, but after reading the books post-TW3, I can say Sapkowski's world feels much more realistic, much more GoT-style than high fantasy.
And the world? Now see, this is where I can't say anything good when comparing DA:I to TW3.
TW3 has a living, breathing world, with a day-night, weather cycle, where people who move and talk and work and sleep...
They had that in TW2, now just went the extra step in Skyrim direction (in their own words, CDPR absolutely adore Skyrim) and made it open world.
Where as DA:I's world feels like a cardboard world made up specifically for your hero to quest in. All the NPCs stand in one place, everything feels dead and not real.
...
Now, I will say I went into Witcher 3 with an open mind.
I considered BG2, PS:T, DA:Origins, Dark Souls and Skyrim to be the pinnacle of RPGs at the time. Different games, but all deep RPGs in their own way.
DA2 was a letdown for me, and DA:I was more shiny and attractive, but just as shallow.
Witcher 3 absolutely blew me away in every aspect: characters, story, world, atmosphere, music, cut scenes (no game did cut scenes better IMO, maybe Last of Us... sick silent emotions and facial animations), combat...
...
Whether we like it or not here, on Bioware forums, TW3 is the new measuring stick for RPGs - and honestly, for gaming in general.
Both in game design, depth and quality - and how the dev treats their fans.