how does that work when Gotham is darker, has more scope, more expensive, better look, better actors, and is more adult. To most arrow fans the show can do no wrong so I can abide with that but for you to say flash is better than Gotham is quite out there
While the Flash does take a lighter approach to the comic book show, it is actually refreshing and not a negative. It may also have a cheaper budget, but they have done a very good job in utilizing the powers of Flash and it is often more interesting to watch visually than anything on Gotham.
Gotham being more expansive has actually hurt them, as they often have 3 or 4 stories going at once and cram characters into episodes when they are not really needed. I would say Flash has made better use of the actors they do have as well. Grant Gustin has been a more compelling lead as Flash than Gordon has. The team around him has been established way better than the cops around Gordon. Jesse L Martin has been great as his surrogate dad and Wheelchair Wells is great as someone who is playing 2 sides of a coin.
Flash also deals with some very adult issues as well, as a large part of the character is motivated by the death of his mother and false imprisonment of his father. The emotional moments on Flash have been better than the ones on Gotham.
I'm just saying this in case you may have dismissed the show early or not given it a chance, to maybe reconsider. I watch both and Flash is way more of an effective show.