Usually a grilled chicken breast will be the better choice. Turkey burgers tend to contain the skin, which makes the fat and calories a lot higher. As for the side, I would suggest sweet potato fries. The calories will likely be pretty close with all of them, but you get a lot of vitamins from sweet potatoes.
However, if you have the choice of a side salad, baked potato, or veggies instead, it would be best for your waistline to choose one of those. I know how hard it is to say no to fries though. They're my absolute favorite food.
Started on January 1, 2013