Birth Control Side Effects

I know birth control affects all women differently (as far as side effects)...but I'm curious which ones tend to be the least harsh in the side effects department. 
​I've never been on bc before, but have struggled with my weight over the years and am very concerned that  birth control will put my already weight-gain-prone body into weight gain overdrive.  
​Anyone in my same boat? Have you found something that doesn't make you gain??