Caitlyn or kogmaw?

Ok so i know that caitlyn has a good early game and kogmaw destroys tanks and has the best late gmae but just write down which one you guys like. Or who you would hate to be in a team fight with. I am level 18 or something. The adc i have is lucian trist twitch and stuff. Lucian is really good but im just looking for a change. thanks