Gotham or legends of tomorrow?

If you prefer the positive vibe of Flash, I think you'll like Legends better, Gotham is a much darker, pre-hero drama(more in the Batman, early-Arrow vibe).

I've watched both and prefer Legends of Tomorrow. It's not perfect. It does have a lot of issues. However, it's closely tied to both Flash and Arrow, which helps if you watch either of those shows. And Gotham is just ridiculously bad. Worse, it thinks it's good. It thinks it's making profound statements. Legends of Tomorrow is light-hearted and doesn't try to be anything more than it is, which is a fun comic book-based series.

Legends of Tomorrow is kind of bad. Its too cheesy, has bad and cringy acting. If you can look past the fact that Gotham has Batman villains despite not having Batman it is actually a great show.

I'm not too impressed with LOT. It's too boring and not much action or character development for my taste.

I like Gotham better

Gotham is way better, legends was so boring, the flash is good though, and the arrow is now meh.