Soda and Coffee for sure, I hate the way energy drinks make me feel; nauseous and jittery. I have a job where once a week, I have to go into work at 2 am, so I usually stay up all night. I've found that the best energy before I start at 2 am is to have a sandwich and a cup of milk. Then I pull an all-nighter. For the most part, I don't need energy from outside sources (coffee, soda etc.) but I do enjoy a cup of hot coffee or tea in the morning or early afternoon. My go-to soda is probably Pepsi, Wild Cherry Pepsi or Cherry Vanilla Pepsi.
For gaming, if I'm going to drink anything it's probably pop or water. When I'm doing laid-back gaming, like with my Dad who's nowhere near as hardcore as myself, I'd say a nice beer (an Extra Gold or something) goes best. Especially when me and my Dad play Tecmo Super Bowl or World Championship Baseball on Intellivision. It's awesome to just sit with my Dad, talk a bit, have a beer or two and play some games together.