Well I was always an advocate of not judging something prior to it coming out. But W3 has come out and I sunk 200 hours into it... So as far as comparable factors go what does DAI do better than W3?
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Nothing. I am serious. Absolutely nothing. Combat, PC selection, all of that are creative differences. In no way can they be compared. Witcher 3 combat is full-action. DAI combat is tactical strategy for the most part (it could have been partly action, and a good one, if they did proper controls for it). PC selection is again a creative choice - W3 lets you play as a character in the game world, while DAI lets YOU be the character - the Inquisitor is nothing more than a 3D model with a voice over, it serves only as a medium through which players communicate with the game world, it has no personality, and even no gender driven traits, which I consider a flaw - what's the point in selecting a different gender, if all that changes is a model and voice?
And don't even get me started on the whole "female friendliness". Every now and then I meet someone claiming how Witcher 3 is "not female-friendly" or "sexist" and I wish ESRB rating would include something like IQ requirement, or otherwise a test to make sure people dense enough to claim something like that don't experience products clearly far above their mental capacity.
Everything else that is comparable - progression, storyline, movement, detail, graphical fidelity, looting and biggest of all - quality of content Witcher 3 undeniably does better. And yes - romance too. For in Witcher 3 romance has meaning. You only have 2 options and they evoke real emotional feedback because the game has you investing a lot in either of them, and having a lot of background behind relationship with both of these characters makes the decision far more weighty. Dragon Age Inquisition doesn't even do what set previous DA games apart when it comes romance - it doesn't let you explore deeper and change personality and views of the characters you romance. That was a key part of previous game's romances and it is missing from Inquisition. DAI romances are nothing more than extra dialogue with a possible sex scene. It has no meaning within the game world.
So now that I played 2 games an equal measure of time, I an say with absolute certainty - DAI is an inferior game to Witcher 3 in every comparable respect. Without exception. Note that I am not hating on Inquisition - it has it's moments, especially if you use teleport hacks in trainers and hack the loot so you never have to collect stuff. But Witcher 3 is just a far far better game. It was created with love, passion and, well... for us. With profits being considered as something that will follow this quality and dedication - as they should be and as they have. Whereas DAI, while certainly having passionate developers, was built upon trends and checklists with developers struggling to balance what Inquisition needed to be with what it was required to be.