I love Fenton; he's amazing !! But.. GizmoDuck is just eh. I personally find him really boring /lh. DarkWing Duck though, he's rlly pog ! He's actually interesting, and I love how he geek's out at random times instead of being scared abt his identity being leaked 24/7 like GizmoDuck /lh. (Also his relationship /p with LP makes my serotonin go nyoOoom so ,, <333)
TLDR; Fenton my beloved <33, but GizmoDuck is boring. DarkWing is much more swag !!