I think of TW as yeah pretty throughly medieval for the most part, lots of squabbles and issues, close to the land sort of thing, dark horrors in the forest, whatever, but with a splash of Arthurian fantasy and other things.
Dragon Age is sort of more like a spin on super-taut high LOTR English thing-a-majig, Dragon Age Inquisition takes that even further with like Solas like super elves etc so it's like a super version of that.
BG and NWN (less for NWN) I see as not really falling easily in either category, sort of more like mid-northern continental Europe Jeanne D'arc legend of Ys sort of, remnants of the Angevin empire/heck Canada or just anywhere in any variety of countries, just generally some region-spanning or continent-spanning perspective.
Personally prefer the 3rd category the most, but can easily see and have enjoyed the appeal of the first, not to mention obvious overlap (particularly between the 1st and 3rd)
I don't know if the 2nd is really ever meant to be "enjoyed" but it can be I guess "appreciated" for it's hyper braininess.