That's next on my list, Witcher 3. I've only read good reports on here...although I only got about 20% of the way into the last Dragon Age before I lost interest.
I did the same thing, but played Witcher 3 first. The main game play difference you'll find is that DAI feelings like a grind, where as W3 feels like one epic story, nothing you do feels like 'oh no not another blah blah quest'.