I've only seen CW once, so I'll get an opportunity to appreciate it more in detail with more viewings. However, I am pretty confident when I say I think TWS is the stronger film. I've used this analogy in another thread, but in comparing the two I'd say CW is a all-you-can-eat buffet where everything is decent but not A+, but TWS is a three-course meal prepped personally by your favourite chef.
TWS has a tighter plot, more in-depth character development and arcs, and action scenes that have a real sense of danger and stakes. There's no question that it's a Captain America movie, and the film never strays from that focus. There are fewer characters (not a bad thing IMO), but each has arc that not only shows them kicking ass but also gives them scenes to really develop (the actors actually get to act). I also liked the more serious tone and how it's rooted in social commentary that's relevant in the real world (i.e. surveillance as protection). The visuals and score are also better (practical effects/stunts >>> CGI)
CW did a good job with all the characters and subplots that it had, and I liked that ventured into more personal, darker and morally-grey territory. However, I think having so many characters and subplots meant that it was stretched thin in some places. Ant-Man and Spiderman - while fun and done well for the most part - really didn't need to be there and just took precious minutes from characters that had real stakes in the plot. The airport battle at times felt like an excuse to bash toys together in creative and fan-pleasing ways, rather than depicting dramatic conflict. For me, the film didn't deliver the promised emotional gut-punches until the third act.
CW has the more ambitious premise and had more potential than TWS, and in most areas it delivers well. However, it does suffer from bloat from being obligated to include so many characters, some of which didn't need to be there. IMO if you're going to include a character or scenes, it better be done for plot-related reasons and not just for marketability. I can understand why a comic-book fan would love seeing Spider-Man and Ant-Man, but at the end of the day I personally am more concerned with how well each character fits into the plot.