Your Opinions On Birth Control Methods?

I'm going to start birth control back up again after having an abortion. (I don't have to explain myself on that) but I'm just curious as to what some of you women prefer? I was on the pill but I want something that I can take and be reassured. I read up on Nexplanon and my only worry is changing birth control is weight gain... I don't want to gain weight and I'm worried what I choose I will. So please tell me your preferences and what you've experienced side-affect wise. 
Thanks!