I guess mine would be.
Arrow Season 2 (because it introduced me to Sara Lance.
)
Gotham Season 4 (because we're really starting to see why Batman is needed)
LoT Season 2 (the LoD and Captain Sara)
LoT Season 3 (Beebo!!! the season started out week but IMO ended stronger than the rest of the CWDC shows)
Flash Season 1 (when it was fun and light and not stupid)